Isabella Bank (ISBA) 10-Q 7 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	ISABELLA BANK CORP
Entity Central Index Key	842,517
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		7,845,606

Interim Condensed Consolidated

Interim Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash and cash equivalents
Cash and demand deposits due from banks	$ 22,055	$ 25,267
Interest bearing balances due from banks	158	5,581
Total cash and cash equivalents	22,213	30,848
Debt Securities, Available-for-sale	524,108	548,730
Available-for-sale Securities, Equity Securities	0	3,577
Mortgage loans AFS	1,420	1,560
Loans
Commercial	691,623	634,759
Agricultural	125,249	128,269
Residential real estate	273,607	272,368
Consumer	61,277	56,123
Gross loans	1,151,756	1,091,519
Less allowance for loan losses	8,200	7,700
Net loans	1,143,556	1,083,819
Premises and equipment	28,267	28,450
Corporate owned life insurance	27,377	27,026
Accrued interest receivable	5,684	7,063
Equity securities without readily determinable fair values	23,743	23,454
Goodwill and other intangible assets	48,497	48,547
Other assets	12,090	10,056
TOTAL ASSETS	1,836,955	1,813,130
Deposits
Noninterest bearing	234,377	237,511
NOW accounts	222,678	231,666
Certificates of deposit under $250 and other savings	745,065	728,090
Certificates of deposit over $250	72,642	67,991
Total deposits	1,274,762	1,265,258
Borrowed funds	362,496	344,878
Accrued interest payable and other liabilities	7,748	8,089
Total liabilities	1,645,006	1,618,225
Shareholders' equity
Common stock — no par value 15,000,000 shares authorized; issued and outstanding 7,933,250 shares (including 21,652 shares held in the Rabbi Trust) in 2018 and 7,857,293 shares (including 31,769 shares held in the Rabbi Trust) in 2017	142,489	140,277
Shares to be issued for deferred compensation obligations	5,423	5,502
Retained earnings	54,204	51,728
Accumulated other comprehensive income	(10,167)	(2,602)
Total shareholders' equity	191,949	194,905
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,836,955	$ 1,813,130

Interim Condensed Consolidated3

Interim Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Available-for-sale securities, amortized cost	$ 533,325
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,933,250	7,857,293
Common stock, shares outstanding	7,933,250	7,857,293
Common stock, shares held in Rabbi Trust	21,652	31,769

Interim Condensed Consolidated4

Interim Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income
Loans, including fees	$ 12,076	$ 10,685	$ 23,372	$ 20,805
AFS securities
Taxable	2,110	2,188	4,232	4,301
Nontaxable	1,331	1,413	2,713	2,828
Federal funds sold and other	196	212	517	425
Total interest income	15,713	14,498	30,834	28,359
Interest expense
Deposits	2,230	1,615	4,276	3,155
Borrowings	1,511	1,413	2,866	2,704
Total interest expense	3,741	3,028	7,142	5,859
Net interest income	11,972	11,470	23,692	22,500
Provision for loan losses	328	9	712	36
Net interest income after provision for loan losses	11,644	11,461	22,980	22,464
Noninterest Income, Service Charges and Fees	1,488	1,405	2,976	2,935
Noninterest income
Net gain on sale of mortgage loans	87	199	168	354
Earnings on corporate owned life insurance policies	181	183	351	363
Debt Securities, Realized Gain (Loss)	0	142	0	142
Other	980	859	1,728	1,610
Total noninterest income	2,736	2,788	5,223	5,404
Noninterest expenses
Compensation and benefits	5,679	4,817	11,173	10,374
Furniture and equipment	1,571	1,352	3,050	2,696
Occupancy	807	815	1,631	1,652
Other	2,727	2,523	5,026	4,736
Total noninterest expenses	10,784	9,507	20,880	19,458
Income before federal income tax expense	3,596	4,742	7,323	8,410
Federal Income Tax Expense (Benefit), Continuing Operations	263	898	528	1,430
NET INCOME	$ 3,333	$ 3,844	$ 6,795	$ 6,980
Earnings per share
Basic (in dollars per share)	$ 0.42	$ 0.49	$ 0.86	$ 0.89
Diluted (in dollars per share)	0.41	0.48	0.84	0.87
Cash dividends per basic share (in dollars per share)	$ 0.26	$ 0.25	$ 0.52	$ 0.50

Interim Condensed Consolidated5

Interim Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 3,333	$ 3,844	$ 6,795	$ 6,980
Unrealized gains (losses) on AFS securities
Unrealized gains (losses) on AFS securities arising during the period	1,978	(2,570)	10,035	(4,247)
Reclassification adjustment for net (gains) losses included in net income	0	(142)	0	(142)
Tax effect	442	(762)	2,126	(1,212)
Unrealized gains (losses) on AFS securities, net of tax	(1,536)	1,666	(7,909)	2,893
Unrealized gains (losses) on derivative instruments arising during the period	31	(61)	153	(44)
Tax effect	(6)	21	(32)	15
Unrealized gains (losses) on derivative instruments, net of tax	25	(40)	121	(29)
Other comprehensive income (loss), net of tax	(1,511)	1,626	(7,788)	2,864
Comprehensive income	$ 1,822	$ 5,470	$ (993)	$ 9,844

Interim Condensed Consolidated6

Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Shares to be Issued for Deferred Compensation Obligations	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balances at Dec. 31, 2016	$ 187,899	$ 139,525	$ 5,038	$ 46,114	$ (2,778)
Beginning balances, shares at Dec. 31, 2016		7,821,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	9,844			6,980	2,864
Issuance of common stock	3,764	$ 3,764
Issuance of common stock, shares		135,516
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	0	$ 176	(176)
Share based payment awards under equity compensation plan	302		302
Common stock purchased for deferred compensation obligations	(197)	(197)
Common stock repurchased pursuant to publicly announced repurchase plan	(2,622)	$ (2,622)
Common stock repurchased pursuant to publicly announced repurchase plan, shares		(94,032)
Cash dividends	(3,920)			(3,920)
Ending balances at Jun. 30, 2017	195,070	$ 140,646	5,164	49,174	86
Ending balances, shares at Jun. 30, 2017		7,862,553
Beginning balances at Dec. 31, 2017	$ 194,905	$ 140,277	5,502	51,728	(2,602)
Beginning balances, shares at Dec. 31, 2017	7,857,293	7,857,293
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	$ (993)			6,795	(7,788)
Issuance of common stock	3,272	$ 3,272
Issuance of common stock, shares		121,437
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	0	$ 383	(383)
Share based payment awards under equity compensation plan	304		304
Common stock purchased for deferred compensation obligations	(205)	(205)
Common stock repurchased pursuant to publicly announced repurchase plan	(1,238)	$ (1,238)
Common stock repurchased pursuant to publicly announced repurchase plan, shares		(45,480)
Cash dividends	(4,096)			(4,096)
Ending balances at Jun. 30, 2018	$ 191,949	$ 142,489	$ 5,423	54,204	(10,167)
Ending balances, shares at Jun. 30, 2018	7,933,250	7,933,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0			$ (223)	$ 223

Interim Condensed Consolidated7

Interim Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.26	$ 0.25	$ 0.52	$ 0.50

Interim Condensed Consolidated8

Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net income	$ 6,795	$ 6,980
Reconciliation of net income to net cash provided by operating activities:
Provision for loan losses	712	36
Impairment of foreclosed assets	0	28
Depreciation	1,448	1,440
Amortization of OMSR	153	170
Amortization of acquisition intangibles	50	62
Net amortization of AFS securities	969	1,062
Unrealized Gain (Loss) on Securities	41	0
Debt Securities, Realized Gain (Loss)	0	(142)
Equity Securities, FV-NI, Realized Gain (Loss)	(1)	0
Net gain on sale of mortgage loans	(168)	(354)
Increase in cash value of corporate owned life insurance policies	(351)	(363)
Share-based payment awards under equity compensation plan	304	302
Proceeds from loan sales	(10,178)	(19,081)
Proceeds from loan sales	10,486	19,769
Net changes in operating assets and liabilities which provided (used) cash:
Accrued interest receivable	1,379	894
Other assets	(353)	(1,734)
Accrued interest payable and other liabilities	(341)	(382)
Net cash provided by (used in) operating activities	10,945	8,687
Proceeds from Sale of Debt Securities, Available-for-sale	0	12,827
Activity in AFS securities
Maturities and calls	39,609	45,021
Purchases	(25,991)	(64,429)
Proceeds from Sale of Available-for-sale Securities, Equity	3,537	0
Net loan principal (originations) collections	(60,517)	(37,842)
Proceeds from sales of foreclosed assets	192	98
Purchases of premises and equipment	(1,265)	(805)
Net cash provided by (used in) investing activities	(44,435)	(45,130)
FINANCING ACTIVITIES
Net increase (decrease) in deposits	9,504	15,112
Increase in other borrowed funds	17,618	23,246
Cash dividends paid on common stock	(4,096)	(3,920)
Proceeds from issuance of common stock	3,272	3,764
Common stock repurchased	(1,238)	(2,622)
Common stock purchased for deferred compensation obligations	(205)	(197)
Increase (decrease) in cash and cash equivalents	(8,635)	(1,060)
Cash and cash equivalents at beginning of period	30,848	22,894
Cash and cash equivalents at end of period	22,213	21,834
Net cash provided by (used in) financing activities	24,855	35,383
SUPPLEMENTAL CASH FLOWS INFORMATION:
Interest paid	7,120	5,872
Federal income taxes paid	0	1,630
SUPPLEMENTAL NONCASH INFORMATION:
Transfers of loans to foreclosed assets	$ 68	$ 124

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation As used in these notes, as well as in Management's Discussion and Analysis of Financial Condition and Results of Operations , references to “Isabella,” the “Corporation,” “we,” “our,” “us,” and similar terms refer to the consolidated entity consisting of Isabella Bank Corporation and its subsidiaries. Isabella Bank Corporation refers solely to the parent holding company, and Isabella Bank or the “Bank” refers to Isabella Bank Corporation ’s subsidiary, Isabella Bank . The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In our opinion, all adjustments considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to our Annual Report on Form 10-K for the year ended December 31, 2017 . Our accounting policies are materially the same as those discussed in Note 1 to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 . Reclassifications: Certain amounts reported in the interim 2017 consolidated financial statements have been reclassified to conform with the 2018 presentation.

Pending Accounting Standards Up

Pending Accounting Standards Updates	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Pending Accounting Standards Updates	Accounting Standards Updates Recently Adopted Accounting Standards Updates ASU No. 2014-09: “Revenue from Contracts with Customers” In May 2014, ASU No. 2014-09 was issued and created new Topic 606 to provide a common revenue standard to achieve consistency and clarification to the revenue recognition principles. The guidance outlines steps to achieve the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. These steps consist of: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The new authoritative guidance, as amended, was effective on January 1, 2018. We reviewed our contracts related to trust and investment services and those related to other noninterest income to determine if changes in income recognition were required as a result of this guidance. Implementation of this guidance did not have a significant impact on our operating results for the three and six month periods ended June 30, 2018 . ASU No. 2016-01: “Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities” and ASU No. 2018-03: “Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10: Recognition and Measurement of Financial Assets and Financial Liabilities” In January 2016, ASU No. 2016-01 was issued and set forth the following: 1) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; 2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment and requiring measurement of the investment at fair value when an impairment exists; 3) for public entities, eliminates the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) for public entities, requires the use of exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and 7) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2017. As a result of this guidance, the change in the fair value of equity investments has been recorded in net income beginning on January 1, 2018. Equity securities are now recorded separately from AFS securities and are recorded at a fair value which approximates an exit price notion. Adoption of this guidance had an insignificant impact on our operations and its future impact will depend on the fair value of these investments at the future measurement dates. The disclosures related to equity investment securities reflect a fully retrospective presentation for comparative purposes. For discussion of the fair value measurement of financial instruments, refer to “ Note 12 – Fair Value ”. In February 2018, ASU No. 2018-03 was issued and sets forth correction or improvement amendments for specific issues that may arise within the scope of ASU 2016-01. These amendments have been adopted and did not have a significant impact on our operating results or financial statement disclosures. ASU No. 2017-09: “ Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting” In May 2017, ASU No. 2017-09 was issued and provided guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this update. An entity should account for the effects of a modification unless all of the following are met: 1. The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification. 2. The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified. 3. The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2017 and did not have a significant impact on our operating results or financial statement disclosures. Pending Accounting Standards Updates ASU No. 2016-02: “Leases (Topic 842)” In February 2016, ASU No. 2016-02 was issued to create Topic 842 - Leases which will require recognition of lease assets and lease liabilities on the balance sheet for leases previously classified as operating leases. Accounting guidance is set forth for both lessee and lessor accounting. Under lessee accounting, a lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For finance leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize interest on the lease liability separately from amortization of the right-of-use asset in the statement of comprehensive income; and 3) classify repayments of the principal portion of the lease liability within financing activities and payments of interest on the lease liability and variable lease payments within operating activities in the statement of cash flows. For operating leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis; and 3) classify all cash payments within operating activities in the statement of cash flows. The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2018. We have and will continue to review our lease agreements to determine the appropriate treatment under this guidance. We do not expect these changes to have a significant impact on our operating results or financial statement disclosures. ASU No. 2016-13: “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” In June 2016, ASU No. 2016-13 was issued and updated the measurement for credit losses for AFS debt securities and assets measured at amortized cost which include loans, trade receivables, and any other financial assets with the contractual right to receive cash. Current GAAP requires an “incurred loss” methodology for recognizing credit losses that delays recognition until it is probable a loss has been incurred. Under the incurred loss approach, entities are limited to a probable initial recognition threshold when credit losses are measured under GAAP; an entity generally only considers past events and current conditions in measuring the incurred loss. Under the new guidance, the incurred loss impairment methodology in current GAAP is replaced with a methodology that reflects current expected credit losses (CECL). This methodology requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances which applies to assets measured either collectively or individually. The update allows an entity to revert to historical loss information that is reflective of the contractual term (considering the effect of prepayments) for periods that are beyond the time frame for which the entity is able to develop reasonable and supportable forecasts. In addition, the disclosures of credit quality indicators in relation to the amortized cost of financing receivables, a current disclosure requirement, are further disaggregated by year of origination (or vintage). The vintage information will be useful for financial statement users to better assess changes in underwriting standards and credit quality trends in asset portfolios over time and the effect of those changes on credit losses. Overall, the update will allow entities the ability to measure expected credit losses without the restriction of incurred or probable losses that exist under current GAAP. For users of the financial statements, the update provides decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019 and may have a significant impact on our operations and financial statement disclosures as well as that of the banking industry as a whole. We have invested a considerable amount of effort toward this guidance and will continue to invest considerable effort until its effective date. A committee was formed and has developed a road map to implementation. This committee will monitor progress to ensure timely and accurate adoption of the guidance. We have identified and collected required borrower and loan level data, as we recognize that quality data is key to properly identify loan segments and then apply the most appropriate methodology to each segment. We’ve identified a software solution that will support us in estimating the ALLL under CECL guidance and are currently in contract negotiations with the vendor that will enable us to run parallel models during 2019. This will allow us to solidify our methodology for implementation in 2020.

AFS Securities

AFS Securities	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
AFS Securities	AFS Securities The amortized cost and fair value of AFS securities , with gross unrealized gains and losses, are as follows at: June 30, 2018 Amortized Gross Gross Fair Government sponsored enterprises $ 194 $ — $ 4 $ 190 States and political subdivisions 200,976 1,857 560 202,273 Auction rate money market preferred 3,200 — 65 3,135 Mortgage-backed securities 204,411 41 6,815 197,637 Collateralized mortgage obligations 124,544 50 3,721 120,873 Total $ 533,325 $ 1,948 $ 11,165 $ 524,108 December 31, 2017 Amortized Gross Gross Fair Government sponsored enterprises $ 217 $ — $ 1 $ 216 States and political subdivisions 204,131 4,486 143 208,474 Auction rate money market preferred 3,200 — 151 3,049 Mortgage-backed securities 210,757 390 2,350 208,797 Collateralized mortgage obligations 129,607 160 1,573 128,194 Total $ 547,912 $ 5,036 $ 4,218 $ 548,730 The amortized cost and fair value of AFS securities by contractual maturity at June 30, 2018 are as follows: Maturing Securities with Variable Monthly Payments or Noncontractual Maturities Due in After One After Five After Total Government sponsored enterprises $ — $ 194 $ — $ — $ — $ 194 States and political subdivisions 27,593 81,665 62,446 29,272 — 200,976 Auction rate money market preferred — — — — 3,200 3,200 Mortgage-backed securities — — — — 204,411 204,411 Collateralized mortgage obligations — — — — 124,544 124,544 Total amortized cost $ 27,593 $ 81,859 $ 62,446 $ 29,272 $ 332,155 $ 533,325 Fair value $ 27,640 $ 82,336 $ 63,199 $ 29,288 $ 321,645 $ 524,108 Expected maturities for government sponsored enterprises and states and political subdivisions may differ from contractual maturities because issuers may have the right to call or prepay obligations. As the auction rate money market preferred stocks have continual call dates, they are not reported by a specific maturity group. Because of their variable monthly payments, mortgage-backed securities and collateralized mortgage obligations are not reported by a specific maturity group. A summary of the sales activity of AFS securities was as follows for the: Three Months Ended June 30 Six Months Ended June 30 2018 2017 2018 2017 Proceeds from sales of AFS securities $ — $ 12,827 $ — $ 12,827 Gross realized gains (losses) $ — $ 142 $ — $ 142 Applicable income tax expense (benefit) $ — $ 48 $ — $ 48 The following information pertains to AFS securities with gross unrealized losses at June 30, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous loss position. June 30, 2018 Less Than Twelve Months Twelve Months or More Gross Fair Gross Fair Total Government sponsored enterprises $ 4 $ 190 $ — $ — $ 4 States and political subdivisions 378 32,949 182 9,012 560 Auction rate money market preferred — — 65 3,135 65 Mortgage-backed securities 3,265 125,130 3,550 69,214 6,815 Collateralized mortgage obligations 2,490 94,355 1,231 22,523 3,721 Total $ 6,137 $ 252,624 $ 5,028 $ 103,884 $ 11,165 Number of securities in an unrealized loss position: 159 91 250 December 31, 2017 Less Than Twelve Months Twelve Months or More Gross Fair Gross Fair Total Government sponsored enterprises $ 1 $ 216 $ — $ — $ 1 States and political subdivisions 142 16,139 1 188 143 Auction rate money market preferred — — 151 3,049 151 Mortgage-backed securities 454 72,007 1,896 76,065 2,350 Collateralized mortgage obligations 701 76,435 872 25,308 1,573 Total $ 1,298 $ 164,797 $ 2,920 $ 104,610 $ 4,218 Number of securities in an unrealized loss position: 81 24 105 Unrealized losses on our AFS securities portfolio are the result of recent increases in intermediate-term and long-term benchmark interest rates and not credit issues. As of June 30, 2018 and December 31, 2017 , we conducted an analysis to determine whether any AFS securities currently in an unrealized loss position should be other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria: • Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate? • Is the investment credit rating below investment grade? • Is it probable the issuer will be unable to pay the amount when due? • Is it more likely than not that we will have to sell the security before recovery of its cost basis? • Has the duration of the investment been extended? During the fourth quarter of 2016, we identified one municipal bond as other-than-temporarily impaired. While management estimated the OTTI to be realized, we also engaged the services of an independent investment valuation firm to estimate the amount of impairment as of December 31, 2016 . The valuation calculated the estimated market value utilizing two different approaches: 1) Market - Appraisal and Comparable Investments 2) Income - Discounted Cash Flow Method The two methods were then weighted, with a higher weighting applied to the Market approach, to determine the estimated impairment. As a result of this analysis, we reduced the carrying value to $230 which required us to recognized an OTTI of $770 in earnings for the year ended December 31, 2016 . Based on internal analysis of this bond as of June 30, 2018 , there was no additional OTTI recognized as of June 30, 2018 and the carrying value of this bond remained at $230 . Based on our analysis which included the criteria outlined above, the fact that we have asserted that we do not have the intent to sell AFS securities in an unrealized loss position, and considering it is unlikely that we will have to sell any AFS securities in an unrealized loss position before recovery of their cost basis, we do not believe that the values of any other AFS securities are other-than-temporarily impaired as of June 30, 2018 or December 31, 2017 , with the exception of the one municipal bond discussed above.

Loans and ALLL

Loans and ALLL	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Loans and ALLL	Loans and ALLL We grant commercial, agricultural, residential real estate, and consumer loans to customers situated primarily in Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw counties in Michigan. The ability of the borrowers to honor their repayment obligations is often dependent upon the real estate, agricultural, manufacturing, retail, gaming, tourism, higher education, and general economic conditions of this region. Substantially all of our consumer and residential real estate loans are secured by various items of property, while commercial loans are secured primarily by real estate, business assets, and personal guarantees. Some loans are unsecured. Loans that we have the intent and ability to hold in our portfolio are reported at their outstanding principal balance adjusted for any charge-offs , the ALLL , and any deferred fees or costs. Interest income is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the level yield method. The accrual of interest on commercial, agricultural, and residential real estate loans is discontinued at the time the loan is 90 days or more past due unless the credit is well-secured and in the process of collection. Upon transferring the loans to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. For loans that are placed on nonaccrual status or charged-off , all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected, is charged against the ALLL . Loans may be returned to accrual status after six months of continuous performance and achievement of current payment status. Commercial and agricultural loans include loans for commercial real estate, commercial operating loans, advances to mortgage brokers, farmland and agricultural production, and loans to states and political subdivisions. Repayment of these loans is dependent upon the successful operation and management of a business. We minimize our risk by limiting the amount of direct credit exposure to any one borrower to $15,000 . Borrowers with direct credit needs of more than $15,000 are serviced through the use of loan participations with other commercial banks. Commercial and agricultural real estate loans commonly require loan-to-value limits of 80% or less. Depending upon the type of loan, past credit history, and current operating results, we may require the borrower to pledge accounts receivable, inventory, and property and equipment. Personal guarantees are generally required from the owners of closely held corporations, partnerships, and sole proprietorships. In addition, we require annual financial statements, prepare cash flow analyses, and review credit reports. We entered into a mortgage purchase program in 2016 with a financial institution where we participate in advances to mortgage brokers ("advances"). The mortgage brokers originate residential mortgage loans with the intent to sell them on the secondary market. We participate in the advance to the mortgage broker, which is secured by the underlying mortgage loan, until it is ultimately sold on the secondary market. As such, the average life of each participated advance is approximately 20 - 30 days. Funds from the sale of the loan are used to pay off our participation in the advance to the mortgage broker. We classify these advances as commercial loans and include the outstanding balance in commercial loans on our consolidated balance sheet. Under the participation agreement, we committed to a maximum outstanding aggregate amount of $30,000 . The difference between our outstanding balances and the maximum outstanding aggregate amount is classified as “ Unfunded commitments under lines of credit ” in the “ Contractual Obligations and Loan Commitments ” section of the Management's Discussion and Analysis of Financial Condition and Results of Operations of this report. We offer adjustable rate mortgages, construction loans, and fixed rate residential real estate loans which have amortization periods up to a maximum of 30 years. We consider the anticipated direction of interest rates, balance sheet duration, the sensitivity of our balance sheet to changes in interest rates, our liquidity needs, and overall loan demand to determine whether or not to sell fixed rate loans to Freddie Mac . Our lending policies generally limit the maximum loan-to-value ratio on residential real estate loans to 100% of the lower of the appraised value of the property or the purchase price. Private mortgage insurance is typically required on loans with loan-to-value ratios in excess of 80% unless the loan qualifies for government guarantees. Underwriting criteria for originated residential real estate loans generally include: • Evaluation of the borrower’s ability to make monthly payments. • Evaluation of the value of the property securing the loan. • Ensuring the payment of principal, interest, taxes, and hazard insurance does not exceed 28% of a borrower’s gross income. • Ensuring all debt servicing does not exceed 40% of income. • Verification of acceptable credit reports. • Verification of employment, income, and financial information. Appraisals are performed by independent appraisers and reviewed for appropriateness. All mortgage loan requests are reviewed by our mortgage loan committee or through a secondary market underwriting system; loans in excess of $500 require the approval of our Internal Loan Committee, the Executive Loan Committee, the Board of Directors’ Loan Committee, or the Board of Directors. Consumer loans include secured and unsecured personal loans. Loans are amortized for a period of up to 15 years based on the age and value of the underlying collateral. The underwriting emphasis is on a borrower’s perceived intent and ability to pay rather than collateral value. No consumer loans are sold to the secondary market. The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the ALLL when we believe the uncollectability of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the ALLL . The appropriateness of the ALLL is evaluated on a quarterly basis and is based upon a periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. The primary factors behind the determination of the level of the ALLL are specific allocations for impaired loans, historical loss percentages, as well as unallocated components. Specific allocations for impaired loans are primarily determined based on the difference between the loan’s outstanding balance and the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell. Historical loss allocations are calculated at the loan class and segment levels based on a migration analysis of the loan portfolio, with the exception of advances to mortgage brokers, over the preceding five years. With no historical losses on advances to mortgage brokers, there is no allocation in the commercial segment displayed in the following tables based on historical loss factors. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. A summary of changes in the ALLL and the recorded investment in loans by segments follows: Allowance for Loan Losses Three Months Ended June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total April 1, 2018 $ 1,840 $ 1,224 $ 2,482 $ 795 $ 1,859 $ 8,200 Charge-offs (489 ) — (29 ) (48 ) — (566 ) Recoveries 101 — 69 68 — 238 Provision for loan losses 745 (242 ) (355 ) 67 113 328 June 30, 2018 $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200 Allowance for Loan Losses Six Months Ended June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total January 1, 2018 $ 1,706 $ 611 $ 2,563 $ 900 $ 1,920 $ 7,700 Charge-offs (494 ) — (39 ) (136 ) — (669 ) Recoveries 204 — 125 128 — 457 Provision for loan losses 781 371 (482 ) (10 ) 52 712 June 30, 2018 $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200 Allowance for Loan Losses and Recorded Investment in Loans June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total ALLL Individually evaluated for impairment $ 506 $ 102 $ 1,451 $ — $ — $ 2,059 Collectively evaluated for impairment 1,691 880 716 882 1,972 6,141 Total $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200 Loans Individually evaluated for impairment $ 10,030 $ 12,894 $ 7,748 $ 11 $ 30,683 Collectively evaluated for impairment 681,593 112,355 265,859 61,266 1,121,073 Total $ 691,623 $ 125,249 $ 273,607 $ 61,277 $ 1,151,756 Allowance for Loan Losses Three Months Ended June 30, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total April 1, 2017 $ 1,771 $ 527 $ 3,098 $ 671 $ 1,433 $ 7,500 Charge-offs (25 ) — — (44 ) — (69 ) Recoveries 55 — 63 42 — 160 Provision for loan losses 177 (52 ) (563 ) (86 ) 533 9 June 30, 2017 $ 1,978 $ 475 $ 2,598 $ 583 $ 1,966 $ 7,600 Allowance for Loan Losses Six Months Ended June 30, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total January 1, 2017 $ 1,814 $ 884 $ 2,664 $ 624 $ 1,414 $ 7,400 Charge-offs (52 ) — (43 ) (118 ) — (213 ) Recoveries 188 — 99 90 — 377 Provision for loan losses 28 (409 ) (122 ) (13 ) 552 36 June 30, 2017 $ 1,978 $ 475 $ 2,598 $ 583 $ 1,966 $ 7,600 Allowance for Loan Losses and Recorded Investment in Loans December 31, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total ALLL Individually evaluated for impairment $ 650 $ — $ 1,480 $ — $ — $ 2,130 Collectively evaluated for impairment 1,056 611 1,083 900 1,920 5,570 Total $ 1,706 $ 611 $ 2,563 $ 900 $ 1,920 $ 7,700 Loans Individually evaluated for impairment $ 8,099 $ 10,598 $ 7,939 $ 17 $ 26,653 Collectively evaluated for impairment 626,660 117,671 264,429 56,106 1,064,866 Total $ 634,759 $ 128,269 $ 272,368 $ 56,123 $ 1,091,519 The following table displays the credit quality indicators for commercial and agricultural credit exposures based on internally assigned credit risk ratings as of: June 30, 2018 Commercial Agricultural Real Estate Other Advances to Mortgage Brokers Total Real Estate Other Total Total Rating 1 - Excellent $ 23 $ 30 $ — $ 53 $ — $ 34 $ 34 $ 87 2 - High quality 6,144 19,832 — 25,976 3,026 521 3,547 29,523 3 - High satisfactory 117,355 55,626 23,864 196,845 19,751 7,037 26,788 223,633 4 - Low satisfactory 353,308 91,678 — 444,986 45,287 17,964 63,251 508,237 5 - Special mention 12,205 2,171 — 14,376 9,970 5,245 15,215 29,591 6 - Substandard 5,368 2,073 — 7,441 6,623 6,034 12,657 20,098 7 - Vulnerable 1,646 300 — 1,946 2,152 1,605 3,757 5,703 8 - Doubtful — — — — — — — — Total $ 496,049 $ 171,710 $ 23,864 $ 691,623 $ 86,809 $ 38,440 $ 125,249 $ 816,872 December 31, 2017 Commercial Agricultural Real Estate Other Advances to Mortgage Brokers Total Real Estate Other Total Total Rating 1 - Excellent $ 24 $ 316 $ — $ 340 $ — $ 34 $ 34 $ 374 2 - High quality 8,402 12,262 — 20,664 2,909 1,024 3,933 24,597 3 - High satisfactory 131,826 46,668 12,081 190,575 21,072 8,867 29,939 220,514 4 - Low satisfactory 326,166 75,591 — 401,757 47,835 18,467 66,302 468,059 5 - Special mention 8,986 3,889 — 12,875 10,493 8,546 19,039 31,914 6 - Substandard 5,521 2,298 — 7,819 4,325 2,747 7,072 14,891 7 - Vulnerable 729 — — 729 1,531 419 1,950 2,679 8 - Doubtful — — — — — — — — — Total $ 481,654 $ 141,024 $ 12,081 $ 634,759 $ 88,165 $ 40,104 $ 128,269 $ — $ 763,028 Internally assigned credit risk ratings are reviewed, at a minimum, when loans are renewed or when management has knowledge of improvements or deterioration of the credit quality of individual credits. Descriptions of the internally assigned credit risk ratings for commercial and agricultural loans are as follows: 1. EXCELLENT – Substantially Risk Free Credit has strong financial condition and solid earnings history, characterized by: • High liquidity, strong cash flow, low leverage. • Unquestioned ability to meet all obligations when due. • Experienced management, with management succession in place. • Secured by cash. 2. HIGH QUALITY – Limited Risk Credit with sound financial condition and a positive trend in earnings supplemented by: • Favorable liquidity and leverage ratios. • Ability to meet all obligations when due. • Management with successful track record. • Steady and satisfactory earnings history. • If loan is secured, collateral is of high quality and readily marketable. • Access to alternative financing. • Well defined primary and secondary source of repayment. • If supported by guaranty, the financial strength and liquidity of the guarantor(s) are clearly evident. 3. HIGH SATISFACTORY – Reasonable Risk Credit with satisfactory financial condition and further characterized by: • Working capital adequate to support operations. • Cash flow sufficient to pay debts as scheduled. • Management experience and depth appear favorable. • Loan performing according to terms. • If loan is secured, collateral is acceptable and loan is fully protected. 4. LOW SATISFACTORY – Acceptable Risk Credit with bankable risks, although some signs of weaknesses are shown: • Would include most start-up businesses. • Occasional instances of trade slowness or repayment delinquency – may have been 10 - 30 days slow within the past year. • Management’s abilities are apparent, yet unproven. • Weakness in primary source of repayment with adequate secondary source of repayment. • Loan structure generally in accordance with policy. • If secured, loan collateral coverage is marginal. • Adequate cash flow to service debt, but coverage is low. To be classified as less than satisfactory, only one of the following criteria must be met. 5. SPECIAL MENTION – Criticized Credit constitutes an undue and unwarranted credit risk but not to the point of justifying a classification of substandard. The credit risk may be relatively minor yet constitute an unwarranted risk in light of the circumstances surrounding a specific loan: • Downward trend in sales, profit levels, and margins. • Impaired working capital position. • Cash flow is strained in order to meet debt repayment. • Loan delinquency ( 30 - 60 days) and overdrafts may occur. • Shrinking equity cushion. • Diminishing primary source of repayment and questionable secondary source. • Management abilities are questionable. • Weak industry conditions. • Litigation pending against the borrower. • Collateral or guaranty offers limited protection. • Negative debt service coverage, however the credit is well collateralized and payments are current. 6. SUBSTANDARD – Classified Credit where the borrower’s current net worth, paying capacity, and value of the collateral pledged is inadequate. There is a distinct possibility that we will implement collection procedures if the loan deficiencies are not corrected. In addition, the following characteristics may apply: • Sustained losses have severely eroded the equity and cash flow. • Deteriorating liquidity. • Serious management problems or internal fraud. • Original repayment terms liberalized. • Likelihood of bankruptcy. • Inability to access other funding sources. • Reliance on secondary source of repayment. • Litigation filed against borrower. • Collateral provides little or no value. • Requires excessive attention of the loan officer. • Borrower is uncooperative with loan officer. 7. VULNERABLE – Classified Credit is considered “Substandard” and warrants placing on nonaccrual status. Risk of loss is being evaluated and exit strategy options are under review. Other characteristics that may apply: • Insufficient cash flow to service debt. • Minimal or no payments being received. • Limited options available to avoid the collection process. • Transition status, expect action will take place to collect loan without immediate progress being made. 8. DOUBTFUL – Workout Credit has all the weaknesses inherent in a “Substandard” loan with the added characteristic that collection and/or liquidation is pending. The possibility of a loss is extremely high, but its classification as a loss is deferred until liquidation procedures are completed, or reasonably estimable. Other characteristics that may apply: • Normal operations are severely diminished or have ceased. • Seriously impaired cash flow. • Original repayment terms materially altered. • Secondary source of repayment is inadequate. • Survivability as a “going concern” is impossible. • Collection process has begun. • Bankruptcy petition has been filed. • Judgments have been filed. • Portion of the loan balance has been charged-off . Our primary credit quality indicator for residential real estate and consumer loans is the individual loan’s past due aging. The following tables summarize the past due and current loans as of: June 30, 2018 Accruing Interest Total Past Due and Nonaccrual 30-59 60-89 90 Days Nonaccrual Current Total Commercial Commercial real estate $ 1,531 $ 60 $ — $ 1,646 $ 3,237 $ 492,812 $ 496,049 Commercial other 565 827 — 300 1,692 170,018 171,710 Advances to mortgage brokers — — — — — 23,864 23,864 Total commercial 2,096 887 — 1,946 4,929 686,694 691,623 Agricultural Agricultural real estate 576 149 125 2,152 3,002 83,807 86,809 Agricultural other 34 410 — 1,605 2,049 36,391 38,440 Total agricultural 610 559 125 3,757 5,051 120,198 125,249 Residential real estate Senior liens 1,028 350 29 779 2,186 230,258 232,444 Junior liens 33 — 10 43 6,261 6,304 Home equity lines of credit 38 185 — — 223 34,636 34,859 Total residential real estate 1,099 535 29 789 2,452 271,155 273,607 Consumer Secured 18 8 — — 26 57,393 57,419 Unsecured 17 — — — 17 3,841 3,858 Total consumer 35 8 — — 43 61,234 61,277 Total $ 3,840 $ 1,989 $ 154 $ 6,492 $ 12,475 $ 1,139,281 $ 1,151,756 December 31, 2017 Accruing Interest Total Past Due and Nonaccrual 30-59 60-89 90 Days Nonaccrual Current Total Commercial Commercial real estate $ 295 $ 325 $ 54 $ 729 $ 1,403 $ 480,251 $ 481,654 Commercial other 1,069 28 18 — 1,115 139,909 141,024 Advances to mortgage brokers — — — — — 12,081 12,081 Total commercial 1,364 353 72 729 2,518 632,241 634,759 Agricultural Agricultural real estate 84 190 — 1,531 1,805 86,360 88,165 Agricultural other 39 — 104 419 562 39,542 40,104 Total agricultural 123 190 104 1,950 2,367 125,902 128,269 Residential real estate Senior liens 3,718 234 132 325 4,409 225,007 229,416 Junior liens 69 10 — 23 102 6,812 6,914 Home equity lines of credit 293 — 77 — 370 35,668 36,038 Total residential real estate 4,080 244 209 348 4,881 267,487 272,368 Consumer Secured 37 10 10 — 57 52,005 52,062 Unsecured 13 — — — 13 4,048 4,061 Total consumer 50 10 10 — 70 56,053 56,123 Total $ 5,617 $ 797 $ 395 $ 3,027 $ 9,836 $ 1,081,683 $ 1,091,519 Impaired Loans Loans may be classified as impaired if they meet one or more of the following criteria: 1. There has been a charge-off of its principal balance (in whole or in part); 2. The loan has been classified as a TDR ; or 3. The loan is in nonaccrual status. Impairment is measured on a loan-by-loan basis for commercial and agricultural loans by comparing the loan’s outstanding balance to the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Impairment is measured on a loan-by-loan basis for residential real estate and consumer loans by comparing the loan’s unpaid principal balance to the present value of expected future cash flows discounted at the loan’s effective interest rate. We do not recognize interest income on impaired loans in nonaccrual status. For impaired loans not classified as nonaccrual , interest income is recognized daily, as earned, according to the terms of the loan agreement and the principal amount outstanding. The following is a summary of information pertaining to impaired loans as of: June 30, 2018 December 31, 2017 Recorded Balance Unpaid Principal Balance Valuation Allowance Recorded Balance Unpaid Principal Balance Valuation Allowance Impaired loans with a valuation allowance Commercial real estate $ 4,065 $ 4,354 $ 492 $ 4,089 $ 4,378 $ 626 Commercial other 827 827 14 995 995 24 Agricultural real estate 396 396 102 — — — Residential real estate senior liens 7,662 8,232 1,447 7,816 8,459 1,473 Residential real estate junior liens 23 23 4 44 44 7 Total impaired loans with a valuation allowance 12,973 13,832 2,059 12,944 13,876 2,130 Impaired loans without a valuation allowance Commercial real estate 3,701 3,816 1,791 1,865 Commercial other 1,437 1,481 1,224 1,224 Agricultural real estate 7,137 7,137 7,913 7,913 Agricultural other 5,361 5,361 2,685 2,685 Home equity lines of credit 63 363 79 379 Consumer secured 11 11 17 17 Total impaired loans without a valuation allowance 17,710 18,169 13,709 14,083 Impaired loans Commercial 10,030 10,478 506 8,099 8,462 650 Agricultural 12,894 12,894 102 10,598 10,598 — Residential real estate 7,748 8,618 1,451 7,939 8,882 1,480 Consumer 11 11 — 17 17 — Total impaired loans $ 30,683 $ 32,001 $ 2,059 $ 26,653 $ 27,959 $ 2,130 The following is a summary of information pertaining to impaired loans for the: Three Months Ended June 30 2018 2017 Average Recorded Balance Interest Income Recognized Average Recorded Balance Interest Income Recognized Impaired loans with a valuation allowance Commercial real estate $ 5,006 $ 13 $ 4,641 $ 84 Commercial other 1,463 15 1,146 23 Agricultural real estate 639 2 — — Residential real estate senior liens 7,747 16 8,385 83 Residential real estate junior liens 30 — 77 1 Home equity lines of credit — 35 — Total impaired loans with a valuation allowance 14,885 46 14,284 191 Impaired loans without a valuation allowance Commercial real estate 3,084 12 1,576 19 Commercial other 1,301 2 119 2 Agricultural real estate 7,610 237 5,937 58 Agricultural other 3,933 115 2,401 33 Home equity lines of credit 68 — 126 5 Consumer secured 12 — 22 — Total impaired loans without a valuation allowance 16,008 366 10,181 117 Impaired loans Commercial 10,854 42 7,482 128 Agricultural 12,182 354 8,338 91 Residential real estate 7,845 16 8,623 89 Consumer 12 — 22 — Total impaired loans $ 30,893 $ 412 $ 24,465 $ 308 Six Months Ended June 30 2018 2017 Average Recorded Balance Interest Income Recognized Average Recorded Balance Interest Income Recognized Impaired loans with a valuation allowance Commercial real estate $ 5,012 $ 104 $ 4,825 $ 157 Commercial other 1,505 39 1,211 47 Agricultural real estate 540 6 — — Agricultural other — — 34 — Residential real estate senior liens 7,785 90 8,403 166 Residential real estate junior liens 35 — 76 1 Home equity lines of credit — — 18 — Total impaired loans with a valuation allowance 14,877 239 14,567 371 Impaired loans without a valuation allowance Commercial real estate 2,606 47 1,451 52 Commercial other 1,248 19 117 4 Agricultural real estate 7,804 277 4,990 120 Agricultural other 3,264 151 1,920 46 Home equity lines of credit 72 5 129 10 Consumer secured 13 — 23 — Total impaired loans without a valuation allowance 15,007 499 8,630 232 Impaired loans Commercial 10,371 209 7,604 260 Agricultural 11,608 434 6,944 166 Residential real estate 7,892 95 8,626 177 Consumer 13 — 23 — Total impaired loans $ 29,884 $ 738 $ 23,197 $ 603 We had committed to advance $105 and $472 in connection with impaired loans, which includes TDRs , as of June 30, 2018 and December 31, 2017 , respectively. Troubled Debt Restructurings Loan modifications are considered to be TDRs when the modification includes terms outside of normal lending practices to a borrower who is experiencing financial difficulties. Typical concessions granted include, but are not limited to: • Agreeing to interest rates below prevailing market rates for debt with similar risk characteristics. • Extending the amortization period beyond typical lending guidelines for loans with similar risk characteristics. • Agreeing to an interest only payment structure and delaying principal payments. • Forgiving principal. • Forgiving accrued interest. To determine if a borrower is experiencing financial difficulties, factors we consider include: • The borrower is currently in default on any of their debt. • The borrower would likely default on any of their debt if the concession was not granted. • The borrower’s cash flow was insufficient to service all of their debt if the concession was not granted. • The borrower has declared, or is in the process of declaring, bankruptcy. • The borrower is unlikely to continue as a going concern (if the entity is a business). The following is a summary of information pertaining to TDRs granted for the: Three Months Ended June 30 2018 2017 Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Commercial other 1 $ 105 $ 105 1 $ 86 $ 86 Agricultural other 13 3,330 3,306 7 5,445 5,445 Residential real estate Senior liens 5 327 327 3 255 255 Junior liens — — — — — — Total residential real estate 5 327 327 3 255 255 Consumer unsecured — — — — — — Total 19 $ 3,762 $ 3,738 11 $ 5,786 $ 5,786 Six Months Ended June 30 2018 2017 Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Commercial other 4 $ 1,360 $ 1,360 3 $ 313 $ 313 Agricultural other 15 4,391 4,368 7 5,445 5,445 Residential real estate Senior liens 7 493 493 3 255 255 Junior liens — — — 1 8 8 Total residential real estate 7 493 493 4 263 263 Consumer unsecured — — — — — — Total 26 $ 6,244 $ 6,221 14 $ 6,021 $ 6,021 The following table summarizes concessions we granted to borrowers in financial difficulty for the: Three Months Ended June 30 2018 2017 Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Commercial other — $ — 1 $ 105 — $ — 1 $ 86 Agricultural other 6 1,770 7 1,560 4 1,349 3 4,096 Residential real estate Senior liens 1 56 4 271 — — 3 255 Junior liens — — — — — — — — Total residential real estate 1 56 4 271 — — 3 255 Consumer unsecured — — — — — — — — Total 7 $ 1,826 12 $ 1,936 4 $ 1,349 7 $ 4,437 Six Months Ended June 30 2018 2017 Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Commercial other 1 $ 174 3 $ 1,186 — $ — 3 $ 313 Agricultural other 7 1,868 8 2,523 4 1,349 3 4,096 Residential real estate Senior liens 1 56 6 437 — — 3 255 Junior liens — — — — 1 8 — — Total residential real estate 1 56 6 437 1 8 3 255 Consumer unsecured — — — — — — — — Total 9 $ 2,098 17 $ 4,146 5 $ 1,357 9 $ 4,664 We did not restructure any loans by forgiving principal or accrued interest in the three and six month periods ended June 30, 2018 or 2017 . Based on our historical loss experience, losses associated with TDRs are not significantly different than other impaired loans within the same loan segment. As such, TDRs , including TDRs that have been modified in the past 12 months that subsequently defaulted, are analyzed in the same manner as other impaired loans within their respective loan segment. We had no loans that defaulted in the three and six month periods ended June 30, 2018 and June 30, 2017 which were modified within 12 months prior to the default date. The following is a summary of TDR loan balances as of: June 30, 2018 December 31, 2017 TDRs $ 27,801 $ 26,197

Equity Securities Without Readi

Equity Securities Without Readily Determinable Fair Values	6 Months Ended
	Jun. 30, 2018
Equity Method And Other Investments [Abstract]
Equity Securities Without Readily Determinable Fair Values	Equity Securities Without Readily Determinable Fair Values Included in equity securities without readily determinable fair values are restricted securities, which are carried at cost, and investments in unconsolidated entities accounted for under the equity method of accounting. Equity securities without readily determinable fair values consist of the following as of: June 30 December 31 FHLB Stock $ 13,925 $ 13,700 Corporate Settlement Solutions, LLC 7,485 7,421 FRB Stock 1,999 1,999 Other 334 334 Total $ 23,743 $ 23,454

Borrowed Funds

Borrowed Funds	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Borrowed Funds	Borrowed Funds Borrowed funds consist of the following obligations as of: June 30, 2018 December 31, 2017 Amount Rate Amount Rate FHLB advances $ 315,000 2.09 % $ 290,000 1.94 % Securities sold under agreements to repurchase without stated maturity dates 31,296 0.10 % 54,878 0.12 % Federal funds purchased 16,200 2.14 % — — % Total $ 362,496 1.92 % $ 344,878 1.65 % FHLB advances are collateralized by a blanket lien on all qualified 1-4 family residential real estate loans, specific AFS securities , and FHLB stock. The following table lists the maturities and weighted average interest rates of FHLB advances as of: June 30, 2018 December 31, 2017 Amount Rate Amount Rate Fixed rate due 2018 $ 40,000 1.90 % $ 70,000 1.96 % Fixed rate due 2019 100,000 1.94 % 85,000 1.87 % Fixed rate due 2020 55,000 2.18 % 35,000 1.80 % Fixed rate due 2021 50,000 1.91 % 50,000 1.91 % Variable rate due 2021 1 10,000 2.63 % 10,000 1.72 % Fixed rate due 2022 20,000 1.97 % 20,000 1.97 % Fixed rate due 2023 20,000 3.36 % 10,000 3.90 % Fixed rate due 2024 10,000 2.97 % — — % Fixed rate due 2026 10,000 1.17 % 10,000 1.17 % Total $ 315,000 2.09 % $ 290,000 1.94 % (1) Hedged advance (see " Derivative Instruments " section below) Securities sold under agreements to repurchase are classified as secured borrowings and are reflected at the amount of cash received in connection with the transaction. The securities underlying the agreements have a carrying value and a fair value of $31,315 and $54,898 at June 30, 2018 and December 31, 2017 , respectively. Such securities remain under our control. We may be required to provide additional collateral based on the fair value of underlying securities. Securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount Window advances generally mature within one to four days from the transaction date. The following table provides a summary of securities sold under repurchase agreements without stated maturity dates and federal funds purchased. We had no FRB Discount Window advances during the three and six month periods ended June 30, 2018 . Three Months Ended June 30 2018 2017 Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Securities sold under agreements to repurchase without stated maturity dates $ 34,242 $ 32,957 0.09 % $ 55,731 $ 53,841 0.13 % Federal funds purchased 16,200 9,199 1.82 % 5,965 7,496 1.13 % FRB Discount Window — — — % — 88 1.48 % Six Months Ended June 30 2018 2017 Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Securities sold under agreements to repurchase without stated maturity dates $ 38,967 $ 34,467 0.09 % $ 61,131 $ 55,663 0.13 % Federal funds purchased 16,200 6,843 1.77 % 27,300 4,197 1.11 % FRB Discount Window — — — % — 44 1.48 % We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at: June 30 December 31 Pledged to secure borrowed funds $ 423,968 $ 410,988 Pledged to secure repurchase agreements 31,315 54,898 Pledged for public deposits and for other purposes necessary or required by law 34,386 27,976 Total $ 489,669 $ 493,862 AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at: June 30 December 31 States and political subdivisions $ 3,346 $ 7,332 Mortgage-backed securities 6,537 13,199 Collateralized mortgage obligations 21,432 34,367 Total $ 31,315 $ 54,898 AFS securities pledged to repurchase agreements are monitored to ensure the appropriate level is collateralized. In the event of maturities, calls, significant principal repayments, or significant decline in market values, we have adequate levels of AFS securities to pledge to satisfy required collateral. As of June 30, 2018 , we had the ability to borrow up to an additional $112,113 , based on assets pledged as collateral. We had no investment securities that were restricted to be pledged for specific purposes. Derivative Instruments We enter into interest rate swaps to manage exposure to interest rate risk and variability in cash flows. The interest rate swaps, associated with our variable rate borrowings, are designated upon inception as cash flow hedges of forecasted interest payments. We enter into LIBOR-based interest rate swaps that involve the receipt of variable amounts in exchange for fixed rate payments, in effect converting variable rate debt to fixed rate debt. Cash flow hedges are assessed for effectiveness using regression analysis. The effective portion of changes in fair value are recorded in OCI and subsequently reclassified into interest expense in the same period in which the related interest on the variable rate borrowings affects earnings. In the event that a portion of the changes in fair value were determined to be ineffective, the ineffective amount would be recorded in earnings. The following tables provide information on derivatives related to variable rate borrowings as of: June 30, 2018 Pay Rate Receive Rate Remaining Life (Years) Notional Amount Balance Sheet Location Fair Value Derivatives designated as hedging instruments Cash Flow Hedges: Interest rate swaps 1.56 % 3-Month LIBOR 2.7 $ 10,000 Other Assets $ 444 December 31, 2017 Pay Rate Receive Rate Remaining Life (Years) Notional Amount Balance Sheet Location Fair Value Derivatives designated as hedging instruments Cash Flow Hedges: Interest rate swaps 1.56 % 3-Month LIBOR 3.3 $ 10,000 Other Assets $ 291 Derivatives contain an element of credit risk which arises from the possibility that we will incur a loss as a result of a counterparty failing to meet its contractual obligations. Credit risk is minimized through counterparty collateral, transaction limits and monitoring procedures. We also manage dealer credit risk by entering into interest rate derivatives only with primary and highly rated counterparties, the use of ISDA master agreements and counterparty limits. We do not anticipate any losses from failure of interest rate derivative counterparties to honor their obligations.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities , earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of trust and brokerage advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation. We record receivables when revenue is unpaid and collectability is reasonably assured. Accounts receivable balances primarily represent amounts due from customers for which revenue has been recognized. Accounts receivable balances are recorded in the consolidated balance sheets in accrued interest receivable and other assets. For the three and six month periods ended June 30, 2018 and 2017 , we satisfied our performance obligations pursuant to contracts with customers. As a result, we have not recorded contract assets or liabilities. We estimate no returns or allowances for the three and six month periods ended June 30, 2018 and 2017 . Our contracts with customers define our performance obligations with clearly established pricing which did not require us to allocate or disaggregate revenue by performance obligation. A summary of revenue recognized for each major category of contracts with customers, subject to ASC 606, is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Debit card income $ 621 $ 594 $ 1,209 $ 1,124 Trust service fees 434 500 936 911 Brokerage advisory fees 174 166 330 326 Service charges and fees related to deposit accounts 82 86 167 171 Total $ 1,311 $ 1,346 $ 2,642 $ 2,532 A large portion of our revenue consists of interest income which is not subject to the requirements set forth in ASC 606. This recently adopted guidance required us to review our other noninterest revenue sources within the scope of the guidance to ensure appropriate recognition of revenue from contracts with customers. This review process did not identify significant changes related to revenue recognition. As such, we did not record or disclose transactions related to the adoption of this guidance.

Other Noninterest Expenses

Other Noninterest Expenses	6 Months Ended
	Jun. 30, 2018
Other Income and Expenses [Abstract]
Other Noninterest Expenses	Other Noninterest Expenses A summary of expenses included in other noninterest expenses is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Consulting fees $ 359 $ 208 $ 609 $ 413 ATM and debit card fees 234 404 466 620 Audit and related fees 258 237 460 435 Director fees 222 213 431 422 Donations and community relations 210 168 361 298 FDIC insurance premiums 156 155 320 308 Loan underwriting fees 165 192 314 309 Marketing costs 149 100 259 189 Postage and freight 91 110 222 219 Education and travel 101 93 216 189 Printing and supplies 145 103 205 210 All other 637 540 1,163 1,124 Total other $ 2,727 $ 2,523 $ 5,026 $ 4,736

Federal Income Taxes

Federal Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Federal Income Taxes	Federal Income Taxes The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense, which has significantly changed as a result of 2017 Tax Act , is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Income taxes at statutory rate (21% in 2018 and 34% in 2017) $ 755 $ 1,612 $ 1,538 $ 2,859 Effect of nontaxable income Interest income on tax exempt municipal securities (264 ) (454 ) (538 ) (909 ) Earnings on corporate owned life insurance policies (38 ) (62 ) (74 ) (123 ) Effect of tax credits (201 ) (191 ) (401 ) (380 ) Other (8 ) (18 ) (19 ) (36 ) Total effect of nontaxable income (511 ) (725 ) (1,032 ) (1,448 ) Effect of nondeductible expenses 19 11 22 19 Federal income tax expense $ 263 $ 898 $ 528 $ 1,430

Computation of Earnings Per Com

Computation of Earnings Per Common Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	Computation of Earnings Per Common Share Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan . Three Months Ended Six Months Ended 2018 2017 2018 2017 Average number of common shares outstanding for basic calculation 7,912,374 7,841,822 7,887,961 7,834,523 Average potential effect of common shares in the Directors Plan (1) 173,222 190,528 186,174 191,028 Average number of common shares outstanding used to calculate diluted earnings per common share 8,085,596 8,032,350 8,074,135 8,025,551 Net income $ 3,333 $ 3,844 $ 6,795 $ 6,980 Earnings per common share Basic $ 0.42 $ 0.49 $ 0.86 $ 0.89 Diluted $ 0.41 $ 0.48 $ 0.84 $ 0.87 (1) Exclusive of shares held in the Rabbi Trust

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income The following table summarizes the changes in AOCI by component for the: Three Months Ended June 30 2018 2017 Unrealized Unrealized Defined Total Unrealized Unrealized Defined Total Balance, April 1 $ (5,759 ) $ 326 $ (3,223 ) $ (8,656 ) $ 1,257 $ 175 $ (2,972 ) (1,540 ) OCI before reclassifications (1,978 ) 31 — (1,947 ) 2,570 (61 ) — 2,509 Amounts reclassified from AOCI — — — — (142 ) — — (142 ) Subtotal (1,978 ) 31 — (1,947 ) 2,428 (61 ) — 2,367 Tax effect 442 (6 ) — 436 (762 ) 21 — (741 ) OCI, net of tax (1,536 ) 25 — (1,511 ) 1,666 (40 ) — 1,626 Balance, June 30 $ (7,295 ) $ 351 $ (3,223 ) $ (10,167 ) $ 2,923 $ 135 $ (2,972 ) $ 86 Six Months Ended June 30 2018 2017 Unrealized Unrealized Defined Total Unrealized Unrealized Defined Total Balance, January 1 $ 391 $ 230 $ (3,223 ) $ (2,602 ) $ 30 $ 164 $ (2,972 ) $ (2,778 ) OCI before reclassifications (10,035 ) 153 — (9,882 ) 4,247 (44 ) — 4,203 Amounts reclassified from AOCI — — — — (142 ) — — (142 ) Subtotal (10,035 ) 153 — (9,882 ) 4,105 (44 ) — 4,061 Tax effect 2,126 (32 ) — 2,094 (1,212 ) 15 — (1,197 ) OCI, net of tax (7,909 ) 121 — (7,788 ) 2,893 (29 ) — 2,864 Adoption of ASU 2016-01 223 — — 223 — — — — Balance, June 30 $ (7,295 ) $ 351 $ (3,223 ) $ (10,167 ) $ 2,923 $ 135 $ (2,972 ) $ 86 Included in OCI for the three and six month period ended June 30, 2018 are changes in unrealized holding gains and losses related to auction rate money market preferred stocks. For the three and six month periods ended June 30, 2017 , OCI includes changes in unrealized holding gains and losses related to auction rate money market preferred stocks and preferred stocks. For federal income tax purposes, these securities are considered equity investments. As such, no deferred federal income taxes related to unrealized holding gains or losses are expected or recorded. A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the: Three Months Ended June 30 2018 2017 Auction Rate Money Market Preferred Stocks All Other AFS Securities Total Auction Rate Money Market Preferred and Preferred Stocks All Other AFS Securities Total Unrealized gains (losses) arising during the period $ 123 $ (2,101 ) $ (1,978 ) $ 186 $ 2,384 $ 2,570 Reclassification adjustment for net (gains) losses included in net income — — — — (142 ) (142 ) Net unrealized gains (losses) 123 (2,101 ) (1,978 ) 186 2,242 2,428 Tax effect — 442 442 — (762 ) (762 ) Unrealized gains (losses), net of tax $ 123 $ (1,659 ) $ (1,536 ) $ 186 $ 1,480 $ 1,666 Six Months Ended June 30 2018 2017 Auction Rate Money Market Preferred Stocks All Other AFS Securities Total Auction Rate Money Market Preferred and Preferred Stocks All Other AFS Securities Total Unrealized gains (losses) arising during the period $ 86 $ (10,121 ) $ (10,035 ) $ 541 $ 3,706 $ 4,247 Reclassification adjustment for net (gains) losses included in net income — — $ — — (142 ) $ (142 ) Net unrealized gains (losses) 86 (10,121 ) (10,035 ) 541 3,564 4,105 Tax effect — 2,126 2,126 — (1,212 ) (1,212 ) Unrealized gains (losses), net of tax $ 86 $ (7,995 ) $ (7,909 ) $ 541 $ 2,352 $ 2,893

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are: Level 1: Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2: Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market. Level 3: Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods. Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion. Following is a description of the valuation methodologies, key inputs, and an indication of the level of the fair value hierarchy in which the assets or liabilities are classified. AFS securities : AFS securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. Level 2 fair value measurement is based upon quoted prices for similar instruments. If quoted prices are not available, fair values are measured using independent pricing models or other model based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss and liquidity assumptions. The values for Level 1 and Level 2 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources. Equity securities, at fair value : Equity securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. The values for Level 1 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources. Loans : We do not record loans at fair value on a recurring basis. However, from time-to-time , loans are classified as impaired and a specific allowance for loan losses may be established. Loans for which it is probable that payment of interest and principal will be significantly different than the contractual terms of the original loan agreement are considered impaired. Once a loan is identified as impaired, we measure the estimated impairment. The fair value of impaired loans is estimated using one of several methods, including the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less costs to sell, if the loan is collateral dependent. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. We review the net realizable values of the underlying collateral for collateral dependent impaired loans on at least a quarterly basis for all loan types. To determine the collateral value, we utilize independent appraisals, broker price opinions, or internal evaluations. We review these valuations to determine whether an additional discount should be applied given the age of market information that may have been considered as well as other factors such as costs to sell an asset if it is determined that the collateral will be liquidated in connection with the ultimate settlement of the loan. We use these valuations to determine if any specific reserves or charge-offs are necessary. We may obtain new valuations in certain circumstances, including when there has been significant deterioration in the condition of the collateral, if the foreclosure process has begun, or if the existing valuation is deemed to be outdated. The following tables list the quantitative fair value information about impaired loans as of: June 30, 2018 Valuation Technique Fair Value Unobservable Input Actual Range Discount applied to collateral: Real Estate 20% - 30% Equipment 20% - 40% Cash crop inventory 30% - 40% Discounted value $28,624 Livestock 30% Other inventory 50% - 75% Accounts receivable 25% - 50% Liquor license 75% Furniture, fixtures & equipment 35% - 45% December 31, 2017 Valuation Technique Fair Value Unobservable Input Actual Range Discount applied to collateral: Real Estate 20% - 30% Equipment 20% - 35% Cash crop inventory 30% - 40% Discounted value $15,956 Livestock 30% Other inventory 50% - 75% Accounts receivable 50% Liquor license 75% Furniture, fixtures & equipment 35% - 45% Collateral discount rates may have ranges to accommodate differences in the age of the independent appraisal, broker price opinion, or internal evaluation. Derivative instruments: Derivative instruments, consisting solely of interest rate swaps, are recorded at fair value on a recurring basis. Derivatives qualifying as cash flow hedges, when highly effective, are reported at fair value in other assets or other liabilities on our Consolidated Balance Sheets with changes in value recorded in OCI. Should the hedge no longer be considered effective, the ineffective portion of the change in fair value is recorded directly in earnings in the period in which the change occurs. The fair value of a derivative is determined by quoted market prices and model based valuation techniques. As such, we classify derivative instruments as Level 2. The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement. Estimated Fair Values of Financial Instruments Not Recorded at Fair Value in their Entirety on a Recurring Basis Disclosure of the estimated fair values of financial instruments, which differs from carrying values, often requires the use of estimates. In cases where quoted market values in an active market are not available, we use present value techniques and other valuation methods to estimate the fair values of our financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used. The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis were as follows as of: June 30, 2018 Carrying Estimated Level 1 Level 2 Level 3 ASSETS Cash and cash equivalents $ 22,213 $ 22,213 $ 22,213 $ — $ — Mortgage loans AFS 1,420 1,440 — 1,440 — Gross loans 1,151,756 1,151,688 — — 1,151,688 Less allowance for loan and lease losses 8,200 8,200 — — 8,200 Net loans 1,143,556 1,143,488 — — 1,143,488 Accrued interest receivable 5,684 5,684 5,684 — — Equity securities without readily determinable fair values (1) 23,743 N/A — — — OMSR 2,398 2,400 — 2,400 — LIABILITIES Deposits without stated maturities 821,442 821,442 821,442 — — Deposits with stated maturities 453,320 441,266 — 441,266 — Borrowed funds 362,496 357,079 — 357,079 — Accrued interest payable 702 702 702 — — December 31, 2017 Carrying Estimated Level 1 Level 2 Level 3 ASSETS Cash and cash equivalents $ 30,848 $ 30,848 $ 30,848 $ — $ — Mortgage loans AFS 1,560 1,587 — 1,587 — Gross loans 1,091,519 1,056,906 — — 1,056,906 Less allowance for loan and lease losses 7,700 7,700 — — 7,700 Net loans 1,083,819 1,049,206 — — 1,049,206 Accrued interest receivable 7,063 7,063 7,063 — — Equity securities without readily determinable fair values (1) 23,454 N/A — — — OMSR 2,409 2,409 — 2,409 — LIABILITIES Deposits without stated maturities 811,992 811,992 811,992 — — Deposits with stated maturities 453,266 443,892 — 443,892 — Borrowed funds 344,878 342,089 — 342,089 — Accrued interest payable 680 680 680 — — (1) Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment. Financial Instruments Recorded at Fair Value The table below presents the recorded amount of assets and liabilities measured at fair value on: June 30, 2018 December 31, 2017 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Recurring items AFS securities Government-sponsored enterprises $ 190 $ — $ 190 $ — $ 216 $ — $ 216 $ — States and political subdivisions 202,273 — 202,273 — 208,474 — 208,474 — Auction rate money market preferred 3,135 — 3,135 — 3,049 — 3,049 — Mortgage-backed securities 197,637 — 197,637 — 208,797 — 208,797 — Collateralized mortgage obligations 120,873 — 120,873 — 128,194 — 128,194 — Total AFS securities 524,108 — 524,108 — 548,730 — 548,730 — Equity securities — — — — 3,577 3,577 — — Derivative instruments 444 — 444 — 291 — 291 — Nonrecurring items Impaired loans (net of the ALLL) 28,624 — — 28,624 15,956 — — 15,956 Total $ 553,176 $ — $ 524,552 $ 28,624 $ 568,554 $ 3,577 $ 549,021 $ 15,956 Percent of assets and liabilities measured at fair value — % 94.83 % 5.17 % 0.63 % 96.56 % 2.81 % Equity securities are recorded at fair value with changes in fair value recognized through earnings on a recurring basis. For the six month period ended June 30, 2018 , we recorded a loss of $41 through earnings. We had no other assets or liabilities recorded at fair value with changes in fair value recognized through earnings, on a recurring basis or nonrecurring basis, as of June 30, 2018 .

Parent Company Only Financial I

Parent Company Only Financial Information	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information	Parent Company Only Financial Information Interim Condensed Balance Sheets June 30 December 31 ASSETS Cash on deposit at the Bank $ 3,008 $ 185 Investments in subsidiaries 140,413 145,962 Premises and equipment 1,902 1,950 Other assets 51,234 52,253 TOTAL ASSETS $ 196,557 $ 200,350 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 4,608 $ 5,445 Shareholders' equity 191,949 194,905 TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY $ 196,557 $ 200,350 Interim Condensed Statements of Income Three Months Ended Six Months Ended 2018 2017 2018 2017 Income Dividends from subsidiaries $ 3,900 $ 2,600 $ 6,000 $ 4,300 Interest income — — — 2 Management fee and other 855 1,691 1,530 3,241 Total income 4,755 4,291 7,530 7,543 Expenses Compensation and benefits 1,175 1,118 2,159 2,490 Occupancy and equipment 126 432 249 876 Audit and related fees 104 140 173 264 Other 380 634 774 1,175 Total expenses 1,785 2,324 3,355 4,805 Income before income tax benefit and equity in undistributed earnings of subsidiaries 2,970 1,967 4,175 2,738 Federal income tax benefit 192 212 380 528 Income before equity in undistributed earnings of subsidiaries 3,162 2,179 4,555 3,266 Undistributed earnings of subsidiaries 171 1,665 2,240 3,714 Net income $ 3,333 $ 3,844 $ 6,795 $ 6,980 Interim Condensed Statements of Cash Flows Six Months Ended 2018 2017 Operating activities Net income $ 6,795 $ 6,980 Adjustments to reconcile net income to cash provided by operations Undistributed earnings of subsidiaries (2,240 ) (3,714 ) Undistributed earnings of equity securities without readily determinable fair values (64 ) 93 Share-based payment awards under equity compensation plan 304 302 Depreciation 64 77 Changes in operating assets and liabilities which provided (used) cash Other assets 1,084 80 Accrued interest and other liabilities (837 ) (1,219 ) Net cash provided by (used in) operating activities 5,106 2,599 Investing activities Maturities, calls, principal payments, and sales of AFS securities — 249 Sales (purchases) of premises and equipment (16 ) (26 ) Net cash provided by (used in) investing activities (16 ) 223 Financing activities Cash dividends paid on common stock (4,096 ) (3,920 ) Proceeds from the issuance of common stock 3,272 3,764 Common stock repurchased (1,238 ) (2,622 ) Common stock purchased for deferred compensation obligations (205 ) (197 ) Net cash provided by (used in) financing activities (2,267 ) (2,975 ) Increase (decrease) in cash and cash equivalents 2,823 (153 ) Cash and cash equivalents at beginning of period 185 1,297 Cash and cash equivalents at end of period $ 3,008 $ 1,144

Operating Segments

Operating Segments	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Operating Segments	Operating Segments Our reportable segments are based on legal entities that account for at least 10% of net operating results. The operations of the Bank as of June 30, 2018 and 2017 and each of the three and six month periods then ended, represent approximately 90% or more of our consolidated total assets and operating results. As such, no additional segment reporting is presented.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	As used in these notes, as well as in Management's Discussion and Analysis of Financial Condition and Results of Operations , references to “Isabella,” the “Corporation,” “we,” “our,” “us,” and similar terms refer to the consolidated entity consisting of Isabella Bank Corporation and its subsidiaries. Isabella Bank Corporation refers solely to the parent holding company, and Isabella Bank or the “Bank” refers to Isabella Bank Corporation ’s subsidiary, Isabella Bank .
Basis of Accounting	The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In our opinion, all adjustments considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to our Annual Report on Form 10-K for the year ended December 31, 2017 .
Earnings Per Share	Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan .
Available-for-sale Securities	As of June 30, 2018 and December 31, 2017 , we conducted an analysis to determine whether any AFS securities currently in an unrealized loss position should be other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria: • Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate? • Is the investment credit rating below investment grade? • Is it probable the issuer will be unable to pay the amount when due? • Is it more likely than not that we will have to sell the security before recovery of its cost basis? • Has the duration of the investment been extended?
Nonaccrual Loan Status	The accrual of interest on commercial, agricultural, and residential real estate loans is discontinued at the time the loan is 90 days or more past due unless the credit is well-secured and in the process of collection. Upon transferring the loans to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. For loans that are placed on nonaccrual status or charged-off , all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected, is charged against the ALLL . Loans may be returned to accrual status after six months of continuous performance and achievement of current payment status.
Loans Receivable	Loans that we have the intent and ability to hold in our portfolio are reported at their outstanding principal balance adjusted for any charge-offs , the ALLL , and any deferred fees or costs. Interest income is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the level yield method. Commercial and agricultural loans include loans for commercial real estate, commercial operating loans, advances to mortgage brokers, farmland and agricultural production, and loans to states and political subdivisions. Repayment of these loans is dependent upon the successful operation and management of a business. We minimize our risk by limiting the amount of direct credit exposure to any one borrower to $15,000 . Borrowers with direct credit needs of more than $15,000 are serviced through the use of loan participations with other commercial banks. Commercial and agricultural real estate loans commonly require loan-to-value limits of 80% or less. Depending upon the type of loan, past credit history, and current operating results, we may require the borrower to pledge accounts receivable, inventory, and property and equipment. Personal guarantees are generally required from the owners of closely held corporations, partnerships, and sole proprietorships. In addition, we require annual financial statements, prepare cash flow analyses, and review credit reports. We entered into a mortgage purchase program in 2016 with a financial institution where we participate in advances to mortgage brokers ("advances"). The mortgage brokers originate residential mortgage loans with the intent to sell them on the secondary market. We participate in the advance to the mortgage broker, which is secured by the underlying mortgage loan, until it is ultimately sold on the secondary market. As such, the average life of each participated advance is approximately 20 - 30 days. Funds from the sale of the loan are used to pay off our participation in the advance to the mortgage broker. We classify these advances as commercial loans and include the outstanding balance in commercial loans on our consolidated balance sheet. Under the participation agreement, we committed to a maximum outstanding aggregate amount of $30,000 . The difference between our outstanding balances and the maximum outstanding aggregate amount is classified as “ Unfunded commitments under lines of credit ” in the “ Contractual Obligations and Loan Commitments ” section of the Management's Discussion and Analysis of Financial Condition and Results of Operations of this report. We offer adjustable rate mortgages, construction loans, and fixed rate residential real estate loans which have amortization periods up to a maximum of 30 years. We consider the anticipated direction of interest rates, balance sheet duration, the sensitivity of our balance sheet to changes in interest rates, our liquidity needs, and overall loan demand to determine whether or not to sell fixed rate loans to Freddie Mac . Our lending policies generally limit the maximum loan-to-value ratio on residential real estate loans to 100% of the lower of the appraised value of the property or the purchase price. Private mortgage insurance is typically required on loans with loan-to-value ratios in excess of 80% unless the loan qualifies for government guarantees. Underwriting criteria for originated residential real estate loans generally include: • Evaluation of the borrower’s ability to make monthly payments. • Evaluation of the value of the property securing the loan. • Ensuring the payment of principal, interest, taxes, and hazard insurance does not exceed 28% of a borrower’s gross income. • Ensuring all debt servicing does not exceed 40% of income. • Verification of acceptable credit reports. • Verification of employment, income, and financial information. Appraisals are performed by independent appraisers and reviewed for appropriateness. All mortgage loan requests are reviewed by our mortgage loan committee or through a secondary market underwriting system; loans in excess of $500 require the approval of our Internal Loan Committee, the Executive Loan Committee, the Board of Directors’ Loan Committee, or the Board of Directors. Consumer loans include secured and unsecured personal loans. Loans are amortized for a period of up to 15 years based on the age and value of the underlying collateral. The underwriting emphasis is on a borrower’s perceived intent and ability to pay rather than collateral value. No consumer loans are sold to the secondary market.
Allowance for Loan Losses	The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the ALLL when we believe the uncollectability of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the ALLL . The appropriateness of the ALLL is evaluated on a quarterly basis and is based upon a periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. The primary factors behind the determination of the level of the ALLL are specific allocations for impaired loans, historical loss percentages, as well as unallocated components. Specific allocations for impaired loans are primarily determined based on the difference between the loan’s outstanding balance and the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell. Historical loss allocations are calculated at the loan class and segment levels based on a migration analysis of the loan portfolio, with the exception of advances to mortgage brokers, over the preceding five years. With no historical losses on advances to mortgage brokers, there is no allocation in the commercial segment displayed in the following tables based on historical loss factors. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.
Internal Credit Risk Ratings	Internally assigned credit risk ratings are reviewed, at a minimum, when loans are renewed or when management has knowledge of improvements or deterioration of the credit quality of individual credits. Descriptions of the internally assigned credit risk ratings for commercial and agricultural loans are as follows: 1. EXCELLENT – Substantially Risk Free Credit has strong financial condition and solid earnings history, characterized by: • High liquidity, strong cash flow, low leverage. • Unquestioned ability to meet all obligations when due. • Experienced management, with management succession in place. • Secured by cash. 2. HIGH QUALITY – Limited Risk Credit with sound financial condition and a positive trend in earnings supplemented by: • Favorable liquidity and leverage ratios. • Ability to meet all obligations when due. • Management with successful track record. • Steady and satisfactory earnings history. • If loan is secured, collateral is of high quality and readily marketable. • Access to alternative financing. • Well defined primary and secondary source of repayment. • If supported by guaranty, the financial strength and liquidity of the guarantor(s) are clearly evident. 3. HIGH SATISFACTORY – Reasonable Risk Credit with satisfactory financial condition and further characterized by: • Working capital adequate to support operations. • Cash flow sufficient to pay debts as scheduled. • Management experience and depth appear favorable. • Loan performing according to terms. • If loan is secured, collateral is acceptable and loan is fully protected. 4. LOW SATISFACTORY – Acceptable Risk Credit with bankable risks, although some signs of weaknesses are shown: • Would include most start-up businesses. • Occasional instances of trade slowness or repayment delinquency – may have been 10 - 30 days slow within the past year. • Management’s abilities are apparent, yet unproven. • Weakness in primary source of repayment with adequate secondary source of repayment. • Loan structure generally in accordance with policy. • If secured, loan collateral coverage is marginal. • Adequate cash flow to service debt, but coverage is low. To be classified as less than satisfactory, only one of the following criteria must be met. 5. SPECIAL MENTION – Criticized Credit constitutes an undue and unwarranted credit risk but not to the point of justifying a classification of substandard. The credit risk may be relatively minor yet constitute an unwarranted risk in light of the circumstances surrounding a specific loan: • Downward trend in sales, profit levels, and margins. • Impaired working capital position. • Cash flow is strained in order to meet debt repayment. • Loan delinquency ( 30 - 60 days) and overdrafts may occur. • Shrinking equity cushion. • Diminishing primary source of repayment and questionable secondary source. • Management abilities are questionable. • Weak industry conditions. • Litigation pending against the borrower. • Collateral or guaranty offers limited protection. • Negative debt service coverage, however the credit is well collateralized and payments are current. 6. SUBSTANDARD – Classified Credit where the borrower’s current net worth, paying capacity, and value of the collateral pledged is inadequate. There is a distinct possibility that we will implement collection procedures if the loan deficiencies are not corrected. In addition, the following characteristics may apply: • Sustained losses have severely eroded the equity and cash flow. • Deteriorating liquidity. • Serious management problems or internal fraud. • Original repayment terms liberalized. • Likelihood of bankruptcy. • Inability to access other funding sources. • Reliance on secondary source of repayment. • Litigation filed against borrower. • Collateral provides little or no value. • Requires excessive attention of the loan officer. • Borrower is uncooperative with loan officer. 7. VULNERABLE – Classified Credit is considered “Substandard” and warrants placing on nonaccrual status. Risk of loss is being evaluated and exit strategy options are under review. Other characteristics that may apply: • Insufficient cash flow to service debt. • Minimal or no payments being received. • Limited options available to avoid the collection process. • Transition status, expect action will take place to collect loan without immediate progress being made. 8. DOUBTFUL – Workout Credit has all the weaknesses inherent in a “Substandard” loan with the added characteristic that collection and/or liquidation is pending. The possibility of a loss is extremely high, but its classification as a loss is deferred until liquidation procedures are completed, or reasonably estimable. Other characteristics that may apply: • Normal operations are severely diminished or have ceased. • Seriously impaired cash flow. • Original repayment terms materially altered. • Secondary source of repayment is inadequate. • Survivability as a “going concern” is impossible. • Collection process has begun. • Bankruptcy petition has been filed. • Judgments have been filed. • Portion of the loan balance has been charged-off .
Impaired Loans	Loans may be classified as impaired if they meet one or more of the following criteria: 1. There has been a charge-off of its principal balance (in whole or in part); 2. The loan has been classified as a TDR ; or 3. The loan is in nonaccrual status. Impairment is measured on a loan-by-loan basis for commercial and agricultural loans by comparing the loan’s outstanding balance to the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Impairment is measured on a loan-by-loan basis for residential real estate and consumer loans by comparing the loan’s unpaid principal balance to the present value of expected future cash flows discounted at the loan’s effective interest rate. We do not recognize interest income on impaired loans in nonaccrual status. For impaired loans not classified as nonaccrual , interest income is recognized daily, as earned, according to the terms of the loan agreement and the principal amount outstanding.
Troubled Debt Restructurings	Loan modifications are considered to be TDRs when the modification includes terms outside of normal lending practices to a borrower who is experiencing financial difficulties. Typical concessions granted include, but are not limited to: • Agreeing to interest rates below prevailing market rates for debt with similar risk characteristics. • Extending the amortization period beyond typical lending guidelines for loans with similar risk characteristics. • Agreeing to an interest only payment structure and delaying principal payments. • Forgiving principal. • Forgiving accrued interest. To determine if a borrower is experiencing financial difficulties, factors we consider include: • The borrower is currently in default on any of their debt. • The borrower would likely default on any of their debt if the concession was not granted. • The borrower’s cash flow was insufficient to service all of their debt if the concession was not granted. • The borrower has declared, or is in the process of declaring, bankruptcy. • The borrower is unlikely to continue as a going concern (if the entity is a business).
Derivative Instruments	The interest rate swaps, associated with our variable rate borrowings, are designated upon inception as cash flow hedges of forecasted interest payments. We enter into LIBOR-based interest rate swaps that involve the receipt of variable amounts in exchange for fixed rate payments, in effect converting variable rate debt to fixed rate debt. Cash flow hedges are assessed for effectiveness using regression analysis. The effective portion of changes in fair value are recorded in OCI and subsequently reclassified into interest expense in the same period in which the related interest on the variable rate borrowings affects earnings. In the event that a portion of the changes in fair value were determined to be ineffective, the ineffective amount would be recorded in earnings.
Fair Value Measurement, Policy [Policy Text Block]	Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are: Level 1: Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2: Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market. Level 3: Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods. Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.

AFS Securities (Tables)

AFS Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized cost and fair value of available-for-sale securities	The amortized cost and fair value of AFS securities , with gross unrealized gains and losses, are as follows at: June 30, 2018 Amortized Gross Gross Fair Government sponsored enterprises $ 194 $ — $ 4 $ 190 States and political subdivisions 200,976 1,857 560 202,273 Auction rate money market preferred 3,200 — 65 3,135 Mortgage-backed securities 204,411 41 6,815 197,637 Collateralized mortgage obligations 124,544 50 3,721 120,873 Total $ 533,325 $ 1,948 $ 11,165 $ 524,108 December 31, 2017 Amortized Gross Gross Fair Government sponsored enterprises $ 217 $ — $ 1 $ 216 States and political subdivisions 204,131 4,486 143 208,474 Auction rate money market preferred 3,200 — 151 3,049 Mortgage-backed securities 210,757 390 2,350 208,797 Collateralized mortgage obligations 129,607 160 1,573 128,194 Total $ 547,912 $ 5,036 $ 4,218 $ 548,730
Amortized cost and fair value of available-for-sale securities by contractual maturity	The amortized cost and fair value of AFS securities by contractual maturity at June 30, 2018 are as follows: Maturing Securities with Variable Monthly Payments or Noncontractual Maturities Due in After One After Five After Total Government sponsored enterprises $ — $ 194 $ — $ — $ — $ 194 States and political subdivisions 27,593 81,665 62,446 29,272 — 200,976 Auction rate money market preferred — — — — 3,200 3,200 Mortgage-backed securities — — — — 204,411 204,411 Collateralized mortgage obligations — — — — 124,544 124,544 Total amortized cost $ 27,593 $ 81,859 $ 62,446 $ 29,272 $ 332,155 $ 533,325 Fair value $ 27,640 $ 82,336 $ 63,199 $ 29,288 $ 321,645 $ 524,108
Schedule of Realized Gain (Loss) [Table Text Block]	A summary of the sales activity of AFS securities was as follows for the: Three Months Ended June 30 Six Months Ended June 30 2018 2017 2018 2017 Proceeds from sales of AFS securities $ — $ 12,827 $ — $ 12,827 Gross realized gains (losses) $ — $ 142 $ — $ 142 Applicable income tax expense (benefit) $ — $ 48 $ — $ 48
Available-for-sale securities with gross unrealized losses	The following information pertains to AFS securities with gross unrealized losses at June 30, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous loss position. June 30, 2018 Less Than Twelve Months Twelve Months or More Gross Fair Gross Fair Total Government sponsored enterprises $ 4 $ 190 $ — $ — $ 4 States and political subdivisions 378 32,949 182 9,012 560 Auction rate money market preferred — — 65 3,135 65 Mortgage-backed securities 3,265 125,130 3,550 69,214 6,815 Collateralized mortgage obligations 2,490 94,355 1,231 22,523 3,721 Total $ 6,137 $ 252,624 $ 5,028 $ 103,884 $ 11,165 Number of securities in an unrealized loss position: 159 91 250 December 31, 2017 Less Than Twelve Months Twelve Months or More Gross Fair Gross Fair Total Government sponsored enterprises $ 1 $ 216 $ — $ — $ 1 States and political subdivisions 142 16,139 1 188 143 Auction rate money market preferred — — 151 3,049 151 Mortgage-backed securities 454 72,007 1,896 76,065 2,350 Collateralized mortgage obligations 701 76,435 872 25,308 1,573 Total $ 1,298 $ 164,797 $ 2,920 $ 104,610 $ 4,218 Number of securities in an unrealized loss position: 81 24 105

Loans and ALLL (Tables)

Loans and ALLL (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Summary of changes in the ALLL and the recorded investment in loans by segments	Allowance for Loan Losses Three Months Ended June 30, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total April 1, 2017 $ 1,771 $ 527 $ 3,098 $ 671 $ 1,433 $ 7,500 Charge-offs (25 ) — — (44 ) — (69 ) Recoveries 55 — 63 42 — 160 Provision for loan losses 177 (52 ) (563 ) (86 ) 533 9 June 30, 2017 $ 1,978 $ 475 $ 2,598 $ 583 $ 1,966 $ 7,600 Allowance for Loan Losses Six Months Ended June 30, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total January 1, 2017 $ 1,814 $ 884 $ 2,664 $ 624 $ 1,414 $ 7,400 Charge-offs (52 ) — (43 ) (118 ) — (213 ) Recoveries 188 — 99 90 — 377 Provision for loan losses 28 (409 ) (122 ) (13 ) 552 36 June 30, 2017 $ 1,978 $ 475 $ 2,598 $ 583 $ 1,966 $ 7,600 A summary of changes in the ALLL and the recorded investment in loans by segments follows: Allowance for Loan Losses Three Months Ended June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total April 1, 2018 $ 1,840 $ 1,224 $ 2,482 $ 795 $ 1,859 $ 8,200 Charge-offs (489 ) — (29 ) (48 ) — (566 ) Recoveries 101 — 69 68 — 238 Provision for loan losses 745 (242 ) (355 ) 67 113 328 June 30, 2018 $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200 Allowance for Loan Losses Six Months Ended June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total January 1, 2018 $ 1,706 $ 611 $ 2,563 $ 900 $ 1,920 $ 7,700 Charge-offs (494 ) — (39 ) (136 ) — (669 ) Recoveries 204 — 125 128 — 457 Provision for loan losses 781 371 (482 ) (10 ) 52 712 June 30, 2018 $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200
Allowance for Loan Losses and Recorded Investment in Loans	Allowance for Loan Losses and Recorded Investment in Loans June 30, 2018 Commercial Agricultural Residential Real Estate Consumer Unallocated Total ALLL Individually evaluated for impairment $ 506 $ 102 $ 1,451 $ — $ — $ 2,059 Collectively evaluated for impairment 1,691 880 716 882 1,972 6,141 Total $ 2,197 $ 982 $ 2,167 $ 882 $ 1,972 $ 8,200 Loans Individually evaluated for impairment $ 10,030 $ 12,894 $ 7,748 $ 11 $ 30,683 Collectively evaluated for impairment 681,593 112,355 265,859 61,266 1,121,073 Total $ 691,623 $ 125,249 $ 273,607 $ 61,277 $ 1,151,756 Allowance for Loan Losses and Recorded Investment in Loans December 31, 2017 Commercial Agricultural Residential Real Estate Consumer Unallocated Total ALLL Individually evaluated for impairment $ 650 $ — $ 1,480 $ — $ — $ 2,130 Collectively evaluated for impairment 1,056 611 1,083 900 1,920 5,570 Total $ 1,706 $ 611 $ 2,563 $ 900 $ 1,920 $ 7,700 Loans Individually evaluated for impairment $ 8,099 $ 10,598 $ 7,939 $ 17 $ 26,653 Collectively evaluated for impairment 626,660 117,671 264,429 56,106 1,064,866 Total $ 634,759 $ 128,269 $ 272,368 $ 56,123 $ 1,091,519
Credit quality indicators for commercial and agricultural credit exposures	The following table displays the credit quality indicators for commercial and agricultural credit exposures based on internally assigned credit risk ratings as of: June 30, 2018 Commercial Agricultural Real Estate Other Advances to Mortgage Brokers Total Real Estate Other Total Total Rating 1 - Excellent $ 23 $ 30 $ — $ 53 $ — $ 34 $ 34 $ 87 2 - High quality 6,144 19,832 — 25,976 3,026 521 3,547 29,523 3 - High satisfactory 117,355 55,626 23,864 196,845 19,751 7,037 26,788 223,633 4 - Low satisfactory 353,308 91,678 — 444,986 45,287 17,964 63,251 508,237 5 - Special mention 12,205 2,171 — 14,376 9,970 5,245 15,215 29,591 6 - Substandard 5,368 2,073 — 7,441 6,623 6,034 12,657 20,098 7 - Vulnerable 1,646 300 — 1,946 2,152 1,605 3,757 5,703 8 - Doubtful — — — — — — — — Total $ 496,049 $ 171,710 $ 23,864 $ 691,623 $ 86,809 $ 38,440 $ 125,249 $ 816,872 December 31, 2017 Commercial Agricultural Real Estate Other Advances to Mortgage Brokers Total Real Estate Other Total Total Rating 1 - Excellent $ 24 $ 316 $ — $ 340 $ — $ 34 $ 34 $ 374 2 - High quality 8,402 12,262 — 20,664 2,909 1,024 3,933 24,597 3 - High satisfactory 131,826 46,668 12,081 190,575 21,072 8,867 29,939 220,514 4 - Low satisfactory 326,166 75,591 — 401,757 47,835 18,467 66,302 468,059 5 - Special mention 8,986 3,889 — 12,875 10,493 8,546 19,039 31,914 6 - Substandard 5,521 2,298 — 7,819 4,325 2,747 7,072 14,891 7 - Vulnerable 729 — — 729 1,531 419 1,950 2,679 8 - Doubtful — — — — — — — — — Total $ 481,654 $ 141,024 $ 12,081 $ 634,759 $ 88,165 $ 40,104 $ 128,269 $ — $ 763,028
Summary of past due and current loans	The following tables summarize the past due and current loans as of: June 30, 2018 Accruing Interest Total Past Due and Nonaccrual 30-59 60-89 90 Days Nonaccrual Current Total Commercial Commercial real estate $ 1,531 $ 60 $ — $ 1,646 $ 3,237 $ 492,812 $ 496,049 Commercial other 565 827 — 300 1,692 170,018 171,710 Advances to mortgage brokers — — — — — 23,864 23,864 Total commercial 2,096 887 — 1,946 4,929 686,694 691,623 Agricultural Agricultural real estate 576 149 125 2,152 3,002 83,807 86,809 Agricultural other 34 410 — 1,605 2,049 36,391 38,440 Total agricultural 610 559 125 3,757 5,051 120,198 125,249 Residential real estate Senior liens 1,028 350 29 779 2,186 230,258 232,444 Junior liens 33 — 10 43 6,261 6,304 Home equity lines of credit 38 185 — — 223 34,636 34,859 Total residential real estate 1,099 535 29 789 2,452 271,155 273,607 Consumer Secured 18 8 — — 26 57,393 57,419 Unsecured 17 — — — 17 3,841 3,858 Total consumer 35 8 — — 43 61,234 61,277 Total $ 3,840 $ 1,989 $ 154 $ 6,492 $ 12,475 $ 1,139,281 $ 1,151,756 December 31, 2017 Accruing Interest Total Past Due and Nonaccrual 30-59 60-89 90 Days Nonaccrual Current Total Commercial Commercial real estate $ 295 $ 325 $ 54 $ 729 $ 1,403 $ 480,251 $ 481,654 Commercial other 1,069 28 18 — 1,115 139,909 141,024 Advances to mortgage brokers — — — — — 12,081 12,081 Total commercial 1,364 353 72 729 2,518 632,241 634,759 Agricultural Agricultural real estate 84 190 — 1,531 1,805 86,360 88,165 Agricultural other 39 — 104 419 562 39,542 40,104 Total agricultural 123 190 104 1,950 2,367 125,902 128,269 Residential real estate Senior liens 3,718 234 132 325 4,409 225,007 229,416 Junior liens 69 10 — 23 102 6,812 6,914 Home equity lines of credit 293 — 77 — 370 35,668 36,038 Total residential real estate 4,080 244 209 348 4,881 267,487 272,368 Consumer Secured 37 10 10 — 57 52,005 52,062 Unsecured 13 — — — 13 4,048 4,061 Total consumer 50 10 10 — 70 56,053 56,123 Total $ 5,617 $ 797 $ 395 $ 3,027 $ 9,836 $ 1,081,683 $ 1,091,519
Information pertaining to impaired loans	The following is a summary of information pertaining to impaired loans as of: June 30, 2018 December 31, 2017 Recorded Balance Unpaid Principal Balance Valuation Allowance Recorded Balance Unpaid Principal Balance Valuation Allowance Impaired loans with a valuation allowance Commercial real estate $ 4,065 $ 4,354 $ 492 $ 4,089 $ 4,378 $ 626 Commercial other 827 827 14 995 995 24 Agricultural real estate 396 396 102 — — — Residential real estate senior liens 7,662 8,232 1,447 7,816 8,459 1,473 Residential real estate junior liens 23 23 4 44 44 7 Total impaired loans with a valuation allowance 12,973 13,832 2,059 12,944 13,876 2,130 Impaired loans without a valuation allowance Commercial real estate 3,701 3,816 1,791 1,865 Commercial other 1,437 1,481 1,224 1,224 Agricultural real estate 7,137 7,137 7,913 7,913 Agricultural other 5,361 5,361 2,685 2,685 Home equity lines of credit 63 363 79 379 Consumer secured 11 11 17 17 Total impaired loans without a valuation allowance 17,710 18,169 13,709 14,083 Impaired loans Commercial 10,030 10,478 506 8,099 8,462 650 Agricultural 12,894 12,894 102 10,598 10,598 — Residential real estate 7,748 8,618 1,451 7,939 8,882 1,480 Consumer 11 11 — 17 17 — Total impaired loans $ 30,683 $ 32,001 $ 2,059 $ 26,653 $ 27,959 $ 2,130 The following is a summary of information pertaining to impaired loans for the: Three Months Ended June 30 2018 2017 Average Recorded Balance Interest Income Recognized Average Recorded Balance Interest Income Recognized Impaired loans with a valuation allowance Commercial real estate $ 5,006 $ 13 $ 4,641 $ 84 Commercial other 1,463 15 1,146 23 Agricultural real estate 639 2 — — Residential real estate senior liens 7,747 16 8,385 83 Residential real estate junior liens 30 — 77 1 Home equity lines of credit — 35 — Total impaired loans with a valuation allowance 14,885 46 14,284 191 Impaired loans without a valuation allowance Commercial real estate 3,084 12 1,576 19 Commercial other 1,301 2 119 2 Agricultural real estate 7,610 237 5,937 58 Agricultural other 3,933 115 2,401 33 Home equity lines of credit 68 — 126 5 Consumer secured 12 — 22 — Total impaired loans without a valuation allowance 16,008 366 10,181 117 Impaired loans Commercial 10,854 42 7,482 128 Agricultural 12,182 354 8,338 91 Residential real estate 7,845 16 8,623 89 Consumer 12 — 22 — Total impaired loans $ 30,893 $ 412 $ 24,465 $ 308 Six Months Ended June 30 2018 2017 Average Recorded Balance Interest Income Recognized Average Recorded Balance Interest Income Recognized Impaired loans with a valuation allowance Commercial real estate $ 5,012 $ 104 $ 4,825 $ 157 Commercial other 1,505 39 1,211 47 Agricultural real estate 540 6 — — Agricultural other — — 34 — Residential real estate senior liens 7,785 90 8,403 166 Residential real estate junior liens 35 — 76 1 Home equity lines of credit — — 18 — Total impaired loans with a valuation allowance 14,877 239 14,567 371 Impaired loans without a valuation allowance Commercial real estate 2,606 47 1,451 52 Commercial other 1,248 19 117 4 Agricultural real estate 7,804 277 4,990 120 Agricultural other 3,264 151 1,920 46 Home equity lines of credit 72 5 129 10 Consumer secured 13 — 23 — Total impaired loans without a valuation allowance 15,007 499 8,630 232 Impaired loans Commercial 10,371 209 7,604 260 Agricultural 11,608 434 6,944 166 Residential real estate 7,892 95 8,626 177 Consumer 13 — 23 — Total impaired loans $ 29,884 $ 738 $ 23,197 $ 603
Information pertaining to TDR's	The following is a summary of TDR loan balances as of: June 30, 2018 December 31, 2017 TDRs $ 27,801 $ 26,197 The following is a summary of information pertaining to TDRs granted for the: Three Months Ended June 30 2018 2017 Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Commercial other 1 $ 105 $ 105 1 $ 86 $ 86 Agricultural other 13 3,330 3,306 7 5,445 5,445 Residential real estate Senior liens 5 327 327 3 255 255 Junior liens — — — — — — Total residential real estate 5 327 327 3 255 255 Consumer unsecured — — — — — — Total 19 $ 3,762 $ 3,738 11 $ 5,786 $ 5,786 Six Months Ended June 30 2018 2017 Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Post-Modification Recorded Investment Commercial other 4 $ 1,360 $ 1,360 3 $ 313 $ 313 Agricultural other 15 4,391 4,368 7 5,445 5,445 Residential real estate Senior liens 7 493 493 3 255 255 Junior liens — — — 1 8 8 Total residential real estate 7 493 493 4 263 263 Consumer unsecured — — — — — — Total 26 $ 6,244 $ 6,221 14 $ 6,021 $ 6,021 The following table summarizes concessions we granted to borrowers in financial difficulty for the: Three Months Ended June 30 2018 2017 Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Commercial other — $ — 1 $ 105 — $ — 1 $ 86 Agricultural other 6 1,770 7 1,560 4 1,349 3 4,096 Residential real estate Senior liens 1 56 4 271 — — 3 255 Junior liens — — — — — — — — Total residential real estate 1 56 4 271 — — 3 255 Consumer unsecured — — — — — — — — Total 7 $ 1,826 12 $ 1,936 4 $ 1,349 7 $ 4,437 Six Months Ended June 30 2018 2017 Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Below Market Interest Rate Below Market Interest Rate and Extension of Amortization Period Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Number of Loans Pre-Modification Recorded Investment Commercial other 1 $ 174 3 $ 1,186 — $ — 3 $ 313 Agricultural other 7 1,868 8 2,523 4 1,349 3 4,096 Residential real estate Senior liens 1 56 6 437 — — 3 255 Junior liens — — — — 1 8 — — Total residential real estate 1 56 6 437 1 8 3 255 Consumer unsecured — — — — — — — — Total 9 $ 2,098 17 $ 4,146 5 $ 1,357 9 $ 4,664

Equity Securities Without Rea26

Equity Securities Without Readily Determinable Fair Values (Tables)	6 Months Ended
	Jun. 30, 2018
Equity Method And Other Investments [Abstract]
Schedule of equity method and other investments	Equity securities without readily determinable fair values consist of the following as of: June 30 December 31 FHLB Stock $ 13,925 $ 13,700 Corporate Settlement Solutions, LLC 7,485 7,421 FRB Stock 1,999 1,999 Other 334 334 Total $ 23,743 $ 23,454

Borrowed Funds (Tables)

Borrowed Funds (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Summary of borrowed funds	Borrowed funds consist of the following obligations as of: June 30, 2018 December 31, 2017 Amount Rate Amount Rate FHLB advances $ 315,000 2.09 % $ 290,000 1.94 % Securities sold under agreements to repurchase without stated maturity dates 31,296 0.10 % 54,878 0.12 % Federal funds purchased 16,200 2.14 % — — % Total $ 362,496 1.92 % $ 344,878 1.65 %
Federal Home Loan Bank, Advances	The following table lists the maturities and weighted average interest rates of FHLB advances as of: June 30, 2018 December 31, 2017 Amount Rate Amount Rate Fixed rate due 2018 $ 40,000 1.90 % $ 70,000 1.96 % Fixed rate due 2019 100,000 1.94 % 85,000 1.87 % Fixed rate due 2020 55,000 2.18 % 35,000 1.80 % Fixed rate due 2021 50,000 1.91 % 50,000 1.91 % Variable rate due 2021 1 10,000 2.63 % 10,000 1.72 % Fixed rate due 2022 20,000 1.97 % 20,000 1.97 % Fixed rate due 2023 20,000 3.36 % 10,000 3.90 % Fixed rate due 2024 10,000 2.97 % — — % Fixed rate due 2026 10,000 1.17 % 10,000 1.17 % Total $ 315,000 2.09 % $ 290,000 1.94 % (1) Hedged advance (see " Derivative Instruments " section below)
Summary of short term borrowings	The following table provides a summary of securities sold under repurchase agreements without stated maturity dates and federal funds purchased. We had no FRB Discount Window advances during the three and six month periods ended June 30, 2018 . Three Months Ended June 30 2018 2017 Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Securities sold under agreements to repurchase without stated maturity dates $ 34,242 $ 32,957 0.09 % $ 55,731 $ 53,841 0.13 % Federal funds purchased 16,200 9,199 1.82 % 5,965 7,496 1.13 % FRB Discount Window — — — % — 88 1.48 % Six Months Ended June 30 2018 2017 Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Maximum Month End Balance Average Balance Weighted Average Interest Rate During the Period Securities sold under agreements to repurchase without stated maturity dates $ 38,967 $ 34,467 0.09 % $ 61,131 $ 55,663 0.13 % Federal funds purchased 16,200 6,843 1.77 % 27,300 4,197 1.11 % FRB Discount Window — — — % — 44 1.48 %
Summary of pledged financial instruments	We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at: June 30 December 31 Pledged to secure borrowed funds $ 423,968 $ 410,988 Pledged to secure repurchase agreements 31,315 54,898 Pledged for public deposits and for other purposes necessary or required by law 34,386 27,976 Total $ 489,669 $ 493,862 AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at: June 30 December 31 States and political subdivisions $ 3,346 $ 7,332 Mortgage-backed securities 6,537 13,199 Collateralized mortgage obligations 21,432 34,367 Total $ 31,315 $ 54,898
Schedule of derivative instruments	The following tables provide information on derivatives related to variable rate borrowings as of: June 30, 2018 Pay Rate Receive Rate Remaining Life (Years) Notional Amount Balance Sheet Location Fair Value Derivatives designated as hedging instruments Cash Flow Hedges: Interest rate swaps 1.56 % 3-Month LIBOR 2.7 $ 10,000 Other Assets $ 444 December 31, 2017 Pay Rate Receive Rate Remaining Life (Years) Notional Amount Balance Sheet Location Fair Value Derivatives designated as hedging instruments Cash Flow Hedges: Interest rate swaps 1.56 % 3-Month LIBOR 3.3 $ 10,000 Other Assets $ 291

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Revenue Recognized for Each Major Category	A summary of revenue recognized for each major category of contracts with customers, subject to ASC 606, is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Debit card income $ 621 $ 594 $ 1,209 $ 1,124 Trust service fees 434 500 936 911 Brokerage advisory fees 174 166 330 326 Service charges and fees related to deposit accounts 82 86 167 171 Total $ 1,311 $ 1,346 $ 2,642 $ 2,532

Other Noninterest Expenses (Tab

Other Noninterest Expenses (Tables)	6 Months Ended
	Jun. 30, 2018
Other Income and Expenses [Abstract]
Summary of expenses included in other noninterest expenses	A summary of expenses included in other noninterest expenses is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Consulting fees $ 359 $ 208 $ 609 $ 413 ATM and debit card fees 234 404 466 620 Audit and related fees 258 237 460 435 Director fees 222 213 431 422 Donations and community relations 210 168 361 298 FDIC insurance premiums 156 155 320 308 Loan underwriting fees 165 192 314 309 Marketing costs 149 100 259 189 Postage and freight 91 110 222 219 Education and travel 101 93 216 189 Printing and supplies 145 103 205 210 All other 637 540 1,163 1,124 Total other $ 2,727 $ 2,523 $ 5,026 $ 4,736

Federal Income Taxes (Tables)

Federal Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Summary of federal income tax expense	The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense, which has significantly changed as a result of 2017 Tax Act , is as follows for the: Three Months Ended Six Months Ended 2018 2017 2018 2017 Income taxes at statutory rate (21% in 2018 and 34% in 2017) $ 755 $ 1,612 $ 1,538 $ 2,859 Effect of nontaxable income Interest income on tax exempt municipal securities (264 ) (454 ) (538 ) (909 ) Earnings on corporate owned life insurance policies (38 ) (62 ) (74 ) (123 ) Effect of tax credits (201 ) (191 ) (401 ) (380 ) Other (8 ) (18 ) (19 ) (36 ) Total effect of nontaxable income (511 ) (725 ) (1,032 ) (1,448 ) Effect of nondeductible expenses 19 11 22 19 Federal income tax expense $ 263 $ 898 $ 528 $ 1,430

Computation of Earnings Per C31

Computation of Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of earnings per common share	Three Months Ended Six Months Ended 2018 2017 2018 2017 Average number of common shares outstanding for basic calculation 7,912,374 7,841,822 7,887,961 7,834,523 Average potential effect of common shares in the Directors Plan (1) 173,222 190,528 186,174 191,028 Average number of common shares outstanding used to calculate diluted earnings per common share 8,085,596 8,032,350 8,074,135 8,025,551 Net income $ 3,333 $ 3,844 $ 6,795 $ 6,980 Earnings per common share Basic $ 0.42 $ 0.49 $ 0.86 $ 0.89 Diluted $ 0.41 $ 0.48 $ 0.84 $ 0.87 (1) Exclusive of shares held in the Rabbi Trust

Accumulated Other Comprehensi32

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Summary of the components of accumulated other comprehensive income	A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the: Three Months Ended June 30 2018 2017 Auction Rate Money Market Preferred Stocks All Other AFS Securities Total Auction Rate Money Market Preferred and Preferred Stocks All Other AFS Securities Total Unrealized gains (losses) arising during the period $ 123 $ (2,101 ) $ (1,978 ) $ 186 $ 2,384 $ 2,570 Reclassification adjustment for net (gains) losses included in net income — — — — (142 ) (142 ) Net unrealized gains (losses) 123 (2,101 ) (1,978 ) 186 2,242 2,428 Tax effect — 442 442 — (762 ) (762 ) Unrealized gains (losses), net of tax $ 123 $ (1,659 ) $ (1,536 ) $ 186 $ 1,480 $ 1,666 Six Months Ended June 30 2018 2017 Auction Rate Money Market Preferred Stocks All Other AFS Securities Total Auction Rate Money Market Preferred and Preferred Stocks All Other AFS Securities Total Unrealized gains (losses) arising during the period $ 86 $ (10,121 ) $ (10,035 ) $ 541 $ 3,706 $ 4,247 Reclassification adjustment for net (gains) losses included in net income — — $ — — (142 ) $ (142 ) Net unrealized gains (losses) 86 (10,121 ) (10,035 ) 541 3,564 4,105 Tax effect — 2,126 2,126 — (1,212 ) (1,212 ) Unrealized gains (losses), net of tax $ 86 $ (7,995 ) $ (7,909 ) $ 541 $ 2,352 $ 2,893 The following table summarizes the changes in AOCI by component for the: Three Months Ended June 30 2018 2017 Unrealized Unrealized Defined Total Unrealized Unrealized Defined Total Balance, April 1 $ (5,759 ) $ 326 $ (3,223 ) $ (8,656 ) $ 1,257 $ 175 $ (2,972 ) (1,540 ) OCI before reclassifications (1,978 ) 31 — (1,947 ) 2,570 (61 ) — 2,509 Amounts reclassified from AOCI — — — — (142 ) — — (142 ) Subtotal (1,978 ) 31 — (1,947 ) 2,428 (61 ) — 2,367 Tax effect 442 (6 ) — 436 (762 ) 21 — (741 ) OCI, net of tax (1,536 ) 25 — (1,511 ) 1,666 (40 ) — 1,626 Balance, June 30 $ (7,295 ) $ 351 $ (3,223 ) $ (10,167 ) $ 2,923 $ 135 $ (2,972 ) $ 86 Six Months Ended June 30 2018 2017 Unrealized Unrealized Defined Total Unrealized Unrealized Defined Total Balance, January 1 $ 391 $ 230 $ (3,223 ) $ (2,602 ) $ 30 $ 164 $ (2,972 ) $ (2,778 ) OCI before reclassifications (10,035 ) 153 — (9,882 ) 4,247 (44 ) — 4,203 Amounts reclassified from AOCI — — — — (142 ) — — (142 ) Subtotal (10,035 ) 153 — (9,882 ) 4,105 (44 ) — 4,061 Tax effect 2,126 (32 ) — 2,094 (1,212 ) 15 — (1,197 ) OCI, net of tax (7,909 ) 121 — (7,788 ) 2,893 (29 ) — 2,864 Adoption of ASU 2016-01 223 — — 223 — — — — Balance, June 30 $ (7,295 ) $ 351 $ (3,223 ) $ (10,167 ) $ 2,923 $ 135 $ (2,972 ) $ 86

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Quantitative information about assets measured utilizing Level 3 fair value measurement	The following tables list the quantitative fair value information about impaired loans as of: June 30, 2018 Valuation Technique Fair Value Unobservable Input Actual Range Discount applied to collateral: Real Estate 20% - 30% Equipment 20% - 40% Cash crop inventory 30% - 40% Discounted value $28,624 Livestock 30% Other inventory 50% - 75% Accounts receivable 25% - 50% Liquor license 75% Furniture, fixtures & equipment 35% - 45% December 31, 2017 Valuation Technique Fair Value Unobservable Input Actual Range Discount applied to collateral: Real Estate 20% - 30% Equipment 20% - 35% Cash crop inventory 30% - 40% Discounted value $15,956 Livestock 30% Other inventory 50% - 75% Accounts receivable 50% Liquor license 75% Furniture, fixtures & equipment 35% - 45%
Carrying amount and estimated fair value of financial instruments not recorded at fair value	The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis were as follows as of: June 30, 2018 Carrying Estimated Level 1 Level 2 Level 3 ASSETS Cash and cash equivalents $ 22,213 $ 22,213 $ 22,213 $ — $ — Mortgage loans AFS 1,420 1,440 — 1,440 — Gross loans 1,151,756 1,151,688 — — 1,151,688 Less allowance for loan and lease losses 8,200 8,200 — — 8,200 Net loans 1,143,556 1,143,488 — — 1,143,488 Accrued interest receivable 5,684 5,684 5,684 — — Equity securities without readily determinable fair values (1) 23,743 N/A — — — OMSR 2,398 2,400 — 2,400 — LIABILITIES Deposits without stated maturities 821,442 821,442 821,442 — — Deposits with stated maturities 453,320 441,266 — 441,266 — Borrowed funds 362,496 357,079 — 357,079 — Accrued interest payable 702 702 702 — — December 31, 2017 Carrying Estimated Level 1 Level 2 Level 3 ASSETS Cash and cash equivalents $ 30,848 $ 30,848 $ 30,848 $ — $ — Mortgage loans AFS 1,560 1,587 — 1,587 — Gross loans 1,091,519 1,056,906 — — 1,056,906 Less allowance for loan and lease losses 7,700 7,700 — — 7,700 Net loans 1,083,819 1,049,206 — — 1,049,206 Accrued interest receivable 7,063 7,063 7,063 — — Equity securities without readily determinable fair values (1) 23,454 N/A — — — OMSR 2,409 2,409 — 2,409 — LIABILITIES Deposits without stated maturities 811,992 811,992 811,992 — — Deposits with stated maturities 453,266 443,892 — 443,892 — Borrowed funds 344,878 342,089 — 342,089 — Accrued interest payable 680 680 680 — — (1) Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment.
Assets and liabilities measured at fair value	The table below presents the recorded amount of assets and liabilities measured at fair value on: June 30, 2018 December 31, 2017 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Recurring items AFS securities Government-sponsored enterprises $ 190 $ — $ 190 $ — $ 216 $ — $ 216 $ — States and political subdivisions 202,273 — 202,273 — 208,474 — 208,474 — Auction rate money market preferred 3,135 — 3,135 — 3,049 — 3,049 — Mortgage-backed securities 197,637 — 197,637 — 208,797 — 208,797 — Collateralized mortgage obligations 120,873 — 120,873 — 128,194 — 128,194 — Total AFS securities 524,108 — 524,108 — 548,730 — 548,730 — Equity securities — — — — 3,577 3,577 — — Derivative instruments 444 — 444 — 291 — 291 — Nonrecurring items Impaired loans (net of the ALLL) 28,624 — — 28,624 15,956 — — 15,956 Total $ 553,176 $ — $ 524,552 $ 28,624 $ 568,554 $ 3,577 $ 549,021 $ 15,956 Percent of assets and liabilities measured at fair value — % 94.83 % 5.17 % 0.63 % 96.56 % 2.81 %

Parent Company Only Financial34

Parent Company Only Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Interim Condensed Balance Sheets	Interim Condensed Balance Sheets June 30 December 31 ASSETS Cash on deposit at the Bank $ 3,008 $ 185 Investments in subsidiaries 140,413 145,962 Premises and equipment 1,902 1,950 Other assets 51,234 52,253 TOTAL ASSETS $ 196,557 $ 200,350 LIABILITIES AND SHAREHOLDERS’ EQUITY Other liabilities $ 4,608 $ 5,445 Shareholders' equity 191,949 194,905 TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY $ 196,557 $ 200,350
Interim Condensed Statements of Income	Interim Condensed Statements of Income Three Months Ended Six Months Ended 2018 2017 2018 2017 Income Dividends from subsidiaries $ 3,900 $ 2,600 $ 6,000 $ 4,300 Interest income — — — 2 Management fee and other 855 1,691 1,530 3,241 Total income 4,755 4,291 7,530 7,543 Expenses Compensation and benefits 1,175 1,118 2,159 2,490 Occupancy and equipment 126 432 249 876 Audit and related fees 104 140 173 264 Other 380 634 774 1,175 Total expenses 1,785 2,324 3,355 4,805 Income before income tax benefit and equity in undistributed earnings of subsidiaries 2,970 1,967 4,175 2,738 Federal income tax benefit 192 212 380 528 Income before equity in undistributed earnings of subsidiaries 3,162 2,179 4,555 3,266 Undistributed earnings of subsidiaries 171 1,665 2,240 3,714 Net income $ 3,333 $ 3,844 $ 6,795 $ 6,980
Interim Condensed Statements of Cash Flows	Interim Condensed Statements of Cash Flows Six Months Ended 2018 2017 Operating activities Net income $ 6,795 $ 6,980 Adjustments to reconcile net income to cash provided by operations Undistributed earnings of subsidiaries (2,240 ) (3,714 ) Undistributed earnings of equity securities without readily determinable fair values (64 ) 93 Share-based payment awards under equity compensation plan 304 302 Depreciation 64 77 Changes in operating assets and liabilities which provided (used) cash Other assets 1,084 80 Accrued interest and other liabilities (837 ) (1,219 ) Net cash provided by (used in) operating activities 5,106 2,599 Investing activities Maturities, calls, principal payments, and sales of AFS securities — 249 Sales (purchases) of premises and equipment (16 ) (26 ) Net cash provided by (used in) investing activities (16 ) 223 Financing activities Cash dividends paid on common stock (4,096 ) (3,920 ) Proceeds from the issuance of common stock 3,272 3,764 Common stock repurchased (1,238 ) (2,622 ) Common stock purchased for deferred compensation obligations (205 ) (197 ) Net cash provided by (used in) financing activities (2,267 ) (2,975 ) Increase (decrease) in cash and cash equivalents 2,823 (153 ) Cash and cash equivalents at beginning of period 185 1,297 Cash and cash equivalents at end of period $ 3,008 $ 1,144

AFS Securities (Amortized cost

AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 533,325	$ 547,912
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,948	5,036
Gross Unrealized Gains	11,165	4,218
AFS securities	524,108	548,730
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	194	217
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Gains	4	1
AFS securities	190	216
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	200,976	204,131
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,857	4,486
Gross Unrealized Gains	560	143
AFS securities	202,273	208,474
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,200	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Gains	65	151
AFS securities	3,135	3,049
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	204,411	210,757
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	41	390
Gross Unrealized Gains	6,815	2,350
AFS securities	197,637	208,797
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	124,544	129,607
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	50	160
Gross Unrealized Gains	3,721	1,573
AFS securities	$ 120,873	$ 128,194

AFS Securities (Amortized cos36

AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details) $ in Thousands	Jun. 30, 2018USD ($)
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	$ 27,593
Maturing, After One Year But Within Five Years	81,859
Maturing, After Five Years But Within Ten Years	62,446
Maturing, After Ten Years	29,272
Securities With Variable Monthly Payments or Noncontractual Maturities	332,155
Amortized Cost	533,325
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less, Fair value	27,640
Maturing, After One Year But Within Five Years, Fair value	82,336
Maturing, After Five Years But Within Ten Years, Fair value	63,199
Maturing, After Ten Years, Fair value	29,288
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value	321,645
Total, Fair value	524,108
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	194
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	0
Amortized Cost	194
States and political subdivisions [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	27,593
Maturing, After One Year But Within Five Years	81,665
Maturing, After Five Years But Within Ten Years	62,446
Maturing, After Ten Years	29,272
Securities With Variable Monthly Payments or Noncontractual Maturities	0
Amortized Cost	200,976
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	3,200
Amortized Cost	3,200
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	204,411
Amortized Cost	204,411
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	124,544
Amortized Cost	$ 124,544

AFS Securities (Activity relate

AFS Securities (Activity related to sales of AFS securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of AFS of securities	$ 0	$ 12,827	$ 0	$ 12,827
Gross realized gains (losses)	0	142	0	142
Applicable income tax expense	$ 0	$ 48	$ 0	$ 48

AFS Securities (AFS securities

AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands	Jun. 30, 2018USD ($)Securities	Dec. 31, 2017USD ($)Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 6,137	$ 1,298
Fair Value, Less Than Twelve Months	252,624	164,797
Gross Unrealized Losses, Twelve Months or More	5,028	2,920
Fair Value, Twelve Months or More	103,884	104,610
Total Unrealized Losses	$ 11,165	$ 4,218
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities	159	81
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities	91	24
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities	250	105
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 4	$ 1
Fair Value, Less Than Twelve Months	190	216
Gross Unrealized Losses, Twelve Months or More	0	0
Fair Value, Twelve Months or More	0	0
Total Unrealized Losses	4	1
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	378	142
Fair Value, Less Than Twelve Months	32,949	16,139
Gross Unrealized Losses, Twelve Months or More	182	1
Fair Value, Twelve Months or More	9,012	188
Total Unrealized Losses	560	143
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	0	0
Fair Value, Less Than Twelve Months	0	0
Gross Unrealized Losses, Twelve Months or More	65	151
Fair Value, Twelve Months or More	3,135	3,049
Total Unrealized Losses	65	151
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	3,265	454
Fair Value, Less Than Twelve Months	125,130	72,007
Gross Unrealized Losses, Twelve Months or More	3,550	1,896
Fair Value, Twelve Months or More	69,214	76,065
Total Unrealized Losses	6,815	2,350
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	2,490	701
Fair Value, Less Than Twelve Months	94,355	76,435
Gross Unrealized Losses, Twelve Months or More	1,231	872
Fair Value, Twelve Months or More	22,523	25,308
Total Unrealized Losses	$ 3,721	$ 1,573

AFS Securities Narratives New (

AFS Securities Narratives New (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2016
Available-for-sale Securities [Member] | Auction Rate Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 0	$ 770

Loans and ALLL (Narrative) (Det

Loans and ALLL (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)NumberofLoan	Jun. 30, 2017NumberofLoan	Jun. 30, 2018USD ($)loanNumberofLoan	Jun. 30, 2017NumberofLoan	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period of continuous performance to return loans to accrual status			6 months
Migration analysis of loan portfolio period			5 years
Advance in connection with impaired loans	$ 105		$ 105		$ 472
Number of loans restructured through the forbearance of principal or accrued interest | NumberofLoan	0	0	0	0
Loans in default	0	0	0	0
Minimum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			10 days
Minimum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			30 days
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term			30 years
Maximum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			30 days
Maximum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			60 days
Commercial, Agricultural, and Residential Portfolio Segments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due (or more), accrual of interest discontinued			90 days
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum days of consumer loan charged off			180 days
Total Consumer [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term			15 years
Commercial And Agricultural Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			0.80
Commercial And Agricultural Portfolio Segment [Member] | Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum amount of loans			$ 15,000
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum amount of loans			$ 30,000
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan advance maturity period			20 days
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan advance maturity period			30 days
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			1
Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income			0.28
Maximum percentage of debt servicing over gross income			0.40
Maximum amount without corporation approval			$ 500
Residential, Privately Insured, Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			0.80

Loans and ALLL (Summary of chan

Loans and ALLL (Summary of changes in ALLL by segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	$ 8,200	$ 7,500	$ 7,700	$ 7,400
Allowance for loan losses, Charge-offs	(566)	(69)	(669)	(213)
Allowance for loan losses, Recoveries	238	160	457	377
Allowance for loan losses, Provision for loan losses	328	9	712	36
Allowance for loan losses, Ending Balance	8,200	7,600	8,200	7,600
Commercial [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	1,840	1,771	1,706	1,814
Allowance for loan losses, Charge-offs	(489)	(25)	(494)	(52)
Allowance for loan losses, Recoveries	101	55	204	188
Allowance for loan losses, Provision for loan losses	745	177	781	28
Allowance for loan losses, Ending Balance	2,197	1,978	2,197	1,978
Agricultural [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	1,224	527	611	884
Allowance for loan losses, Charge-offs	0	0	0	0
Allowance for loan losses, Recoveries	0	0	0	0
Allowance for loan losses, Provision for loan losses	(242)	(52)	371	(409)
Allowance for loan losses, Ending Balance	982	475	982	475
Residential Real Estate [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	2,482	3,098	2,563	2,664
Allowance for loan losses, Charge-offs	(29)	0	(39)	(43)
Allowance for loan losses, Recoveries	69	63	125	99
Allowance for loan losses, Provision for loan losses	(355)	(563)	(482)	(122)
Allowance for loan losses, Ending Balance	2,167	2,598	2,167	2,598
Consumer Portfolio Segment [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	795	671	900	624
Allowance for loan losses, Charge-offs	(48)	(44)	(136)	(118)
Allowance for loan losses, Recoveries	68	42	128	90
Allowance for loan losses, Provision for loan losses	67	(86)	(10)	(13)
Allowance for loan losses, Ending Balance	882	583	882	583
Unallocated [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	1,859	1,433	1,920	1,414
Allowance for loan losses, Charge-offs	0	0	0	0
Allowance for loan losses, Recoveries	0	0	0	0
Allowance for loan losses, Provision for loan losses	113	533	52	552
Allowance for loan losses, Ending Balance	$ 1,972	$ 1,966	$ 1,972	$ 1,966

Loans and ALLL (Summary of reco

Loans and ALLL (Summary of recorded investment in loans by segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	$ 2,059		$ 2,130
Collectively evaluated for impairment, ALLL	6,141		5,570
Total, ALLL	8,200	$ 8,200	7,700	$ 7,600	$ 7,500	$ 7,400
Individually evaluated for impairment, Loans	30,683		26,653
Collectively evaluated for impairment, Loans	1,121,073		1,064,866
Total	1,151,756		1,091,519
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	506		650
Collectively evaluated for impairment, ALLL	1,691		1,056
Total, ALLL	2,197	1,840	1,706	1,978	1,771	1,814
Individually evaluated for impairment, Loans	10,030		8,099
Collectively evaluated for impairment, Loans	681,593		626,660
Total	691,623		634,759
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	102		0
Collectively evaluated for impairment, ALLL	880		611
Total, ALLL	982	1,224	611	475	527	884
Individually evaluated for impairment, Loans	12,894		10,598
Collectively evaluated for impairment, Loans	112,355		117,671
Total	125,249		128,269
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	1,451		1,480
Collectively evaluated for impairment, ALLL	716		1,083
Total, ALLL	2,167	2,482	2,563	2,598	3,098	2,664
Individually evaluated for impairment, Loans	7,748		7,939
Collectively evaluated for impairment, Loans	265,859		264,429
Total	273,607		272,368
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	882		900
Total, ALLL	882	795	900	583	671	624
Individually evaluated for impairment, Loans	11		17
Collectively evaluated for impairment, Loans	61,266		56,106
Total	61,277		56,123
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0		0
Collectively evaluated for impairment, ALLL	1,972		1,920
Total, ALLL	$ 1,972	$ 1,859	$ 1,920	$ 1,966	$ 1,433	$ 1,414

Loans and ALLL (Credit quality

Loans and ALLL (Credit quality indicators for commercial and agricultural credit exposures) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,151,756	$ 1,091,519
Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	691,623	634,759
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	496,049	481,654
Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	171,710	141,024
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,864	12,081
Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	125,249	128,269
Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	86,809	88,165
Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,440	40,104
Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	816,872	763,028
1 - Excellent [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	53	340
1 - Excellent [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23	24
1 - Excellent [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	30	316
1 - Excellent [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
1 - Excellent [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34	34
1 - Excellent [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
1 - Excellent [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34	34
1 - Excellent [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	87	374
2 - High quality [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	25,976	20,664
2 - High quality [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,144	8,402
2 - High quality [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,832	12,262
2 - High quality [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
2 - High quality [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,547	3,933
2 - High quality [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,026	2,909
2 - High quality [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	521	1,024
2 - High quality [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,523	24,597
3 - High satisfactory [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	196,845	190,575
3 - High satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	117,355	131,826
3 - High satisfactory [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	55,626	46,668
3 - High satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,864	12,081
3 - High satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	26,788	29,939
3 - High satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,751	21,072
3 - High satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,037	8,867
3 - High satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	223,633	220,514
4 - Low satisfactory [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	444,986	401,757
4 - Low satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	353,308	326,166
4 - Low satisfactory [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	91,678	75,591
4 - Low satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
4 - Low satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	63,251	66,302
4 - Low satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	45,287	47,835
4 - Low satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	17,964	18,467
4 - Low satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	508,237	468,059
5 - Special mention [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,376	12,875
5 - Special mention [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,205	8,986
5 - Special mention [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,171	3,889
5 - Special mention [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
5 - Special mention [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	15,215	19,039
5 - Special mention [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,970	10,493
5 - Special mention [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,245	8,546
5 - Special mention [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,591	31,914
6 - Substandard [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,441	7,819
6 - Substandard [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,368	5,521
6 - Substandard [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,073	2,298
6 - Substandard [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
6 - Substandard [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,657	7,072
6 - Substandard [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,623	4,325
6 - Substandard [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,034	2,747
6 - Substandard [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	20,098	14,891
7 - Vulnerable [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,946	729
7 - Vulnerable [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,646	729
7 - Vulnerable [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	300	0
7 - Vulnerable [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
7 - Vulnerable [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,757	1,950
7 - Vulnerable [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,152	1,531
7 - Vulnerable [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,605	419
7 - Vulnerable [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,703	2,679
8 - Doubtful [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0

Loans and ALLL (Past due and cu

Loans and ALLL (Past due and current loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 154	$ 395
Nonaccrual	6,492	3,027
Total Past Due and Nonaccrual	12,475	9,836
Current	1,139,281	1,081,683
Total	1,151,756	1,091,519
Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	72
Nonaccrual	1,946	729
Total Past Due and Nonaccrual	4,929	2,518
Current	686,694	632,241
Total	691,623	634,759
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	54
Nonaccrual	1,646	729
Total Past Due and Nonaccrual	3,237	1,403
Current	492,812	480,251
Total	496,049	481,654
Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	18
Nonaccrual	300	0
Total Past Due and Nonaccrual	1,692	1,115
Current	170,018	139,909
Total	171,710	141,024
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Current	23,864	12,081
Total	23,864	12,081
Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	125	104
Nonaccrual	3,757	1,950
Total Past Due and Nonaccrual	5,051	2,367
Current	120,198	125,902
Total	125,249	128,269
Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	125	0
Nonaccrual	2,152	1,531
Total Past Due and Nonaccrual	3,002	1,805
Current	83,807	86,360
Total	86,809	88,165
Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	104
Nonaccrual	1,605	419
Total Past Due and Nonaccrual	2,049	562
Current	36,391	39,542
Total	38,440	40,104
Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	29	209
Nonaccrual	789	348
Total Past Due and Nonaccrual	2,452	4,881
Current	271,155	267,487
Total	273,607	272,368
Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	29	132
Nonaccrual	779	325
Total Past Due and Nonaccrual	2,186	4,409
Current	230,258	225,007
Total	232,444	229,416
Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0
Nonaccrual	10	23
Total Past Due and Nonaccrual	43	102
Current	6,261	6,812
Total	6,304	6,914
Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	77
Nonaccrual	0	0
Total Past Due and Nonaccrual	223	370
Current	34,636	35,668
Total	34,859	36,038
Total Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	10
Nonaccrual	0	0
Total Past Due and Nonaccrual	43	70
Current	61,234	56,053
Total	61,277	56,123
Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	10
Nonaccrual	0	0
Total Past Due and Nonaccrual	26	57
Current	57,393	52,005
Total	57,419	52,062
Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	17	13
Current	3,841	4,048
Total	3,858	4,061
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,840	5,617
Financing Receivables, 30 to 59 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,096	1,364
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,531	295
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	565	1,069
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	610	123
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	576	84
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	34	39
Financing Receivables, 30 to 59 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,099	4,080
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,028	3,718
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	33	69
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	38	293
Financing Receivables, 30 to 59 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	35	50
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	18	37
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	17	13
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,989	797
Financing Receivables, 60 to 89 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	887	353
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	60	325
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	827	28
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	559	190
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	149	190
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	410	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	535	244
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	350	234
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	185	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0

Loans and ALLL (Summary of info

Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	$ 12,973		$ 12,973		$ 12,944
Impaired loans without a valuation allowance, Outstanding Balance	17,710		17,710		13,709
Impaired loans, Outstanding Balance	30,683		30,683		26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	13,832		13,832		13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance	18,169		18,169		14,083
Impaired loans, Unpaid Principal Balance	32,001		32,001		27,959
Impaired loans, Valuation Allowance	2,059		2,059		2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	14,885	$ 14,284	14,877	$ 14,567
Impaired loans without a valuation allowance, Average Outstanding Balance	16,008	10,181	15,007	8,630
Impaired loans, Average Outstanding Balance	30,893	24,465	29,884	23,197
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	46	191	239	371
Impaired loans without a valuation allowance, Interest Income Recognized	366	117	499	232
Impaired loans, Interest Income Recognized	412	308	738	603
Total commercial [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	10,030		10,030		8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	10,478		10,478		8,462
Impaired loans, Valuation Allowance	506		506		650
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	10,854	7,482	10,371	7,604
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	42	128	209	260
Commercial real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	4,065		4,065		4,089
Impaired loans without a valuation allowance, Outstanding Balance	3,701		3,701		1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	4,354		4,354		4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance	3,816		3,816		1,865
Impaired loans, Valuation Allowance	492		492		626
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	5,006	4,641	5,012	4,825
Impaired loans without a valuation allowance, Average Outstanding Balance	3,084	1,576	2,606	1,451
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	13	84	104	157
Impaired loans without a valuation allowance, Interest Income Recognized	12	19	47	52
Commercial other [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	827		827		995
Impaired loans without a valuation allowance, Outstanding Balance	1,437		1,437		1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	827		827		995
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,481		1,481		1,224
Impaired loans, Valuation Allowance	14		14		24
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	1,463	1,146	1,505	1,211
Impaired loans without a valuation allowance, Average Outstanding Balance	1,301	119	1,248	117
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	15	23	39	47
Impaired loans without a valuation allowance, Interest Income Recognized	2	2	19	4
Total agricultural [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	12,894		12,894		10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	12,894		12,894		10,598
Impaired loans, Valuation Allowance	102		102		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	12,182	8,338	11,608	6,944
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	354	91	434	166
Agricultural real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	396		396		0
Impaired loans without a valuation allowance, Outstanding Balance	7,137		7,137		7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	396		396		0
Impaired loans without a valuation allowance, Unpaid Principal Balance	7,137		7,137		7,913
Impaired loans, Valuation Allowance	102		102		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	639	0	540	0
Impaired loans without a valuation allowance, Average Outstanding Balance	7,610	5,937	7,804	4,990
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	2	0	6	0
Impaired loans without a valuation allowance, Interest Income Recognized	237	58	277	120
Agricultural other [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Outstanding Balance	5,361		5,361		2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans without a valuation allowance, Unpaid Principal Balance	5,361		5,361		2,685
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance			0	34
Impaired loans without a valuation allowance, Average Outstanding Balance	3,933	2,401	3,264	1,920
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized			0	0
Impaired loans without a valuation allowance, Interest Income Recognized	115	33	151	46
Total residential real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	7,748		7,748		7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	8,618		8,618		8,882
Impaired loans, Valuation Allowance	1,451		1,451		1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	7,845	8,623	7,892	8,626
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	16	89	95	177
Residential real estate senior liens [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	7,662		7,662		7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	8,232		8,232		8,459
Impaired loans, Valuation Allowance	1,447		1,447		1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	7,747	8,385	7,785	8,403
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	16	83	90	166
Residential real estate junior liens [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	23		23		44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	23		23		44
Impaired loans, Valuation Allowance	4		4		7
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	30	77	35	76
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	0	1	0	1
Residential real estate home equity lines of credit [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Outstanding Balance	63		63		79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans without a valuation allowance, Unpaid Principal Balance	363		363		379
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	0	35	0	18
Impaired loans without a valuation allowance, Average Outstanding Balance	68	126	72	129
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized		0	0	0
Impaired loans without a valuation allowance, Interest Income Recognized	0	5	5	10
Total Consumer [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	11		11		17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	11		11		17
Impaired loans, Valuation Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	12	22	13	23
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	0	0	0	0
Consumer secured [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Outstanding Balance	11		11		17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans without a valuation allowance, Unpaid Principal Balance	11		11		$ 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Average Outstanding Balance	12	22	13	23
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans without a valuation allowance, Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

Loans and ALLL (Summary of in46

Loans and ALLL (Summary of information pertaining to TDRs) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$ 14,885	$ 14,284	$ 14,877	$ 14,567
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 46	$ 191	$ 239	$ 371
Number of Loans | loan	19	11	26	14
Pre-Modification Recorded Investment	$ 3,762	$ 5,786	$ 6,244	$ 6,021
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,738	$ 5,786	$ 6,221	$ 6,021
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	4	9	5
Pre-Modification Recorded Investment	$ 1,826	$ 1,349	$ 2,098	$ 1,357
Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	12	7	17	9
Pre-Modification Recorded Investment	$ 1,936	$ 4,437	$ 4,146	$ 4,664
Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,463	1,146	1,505	1,211
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 15	$ 23	$ 39	$ 47
Number of Loans | loan	1	1	4	3
Pre-Modification Recorded Investment	$ 105	$ 86	$ 1,360	$ 313
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 105	$ 86	$ 1,360	$ 313
Commercial other [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	1	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 174	$ 0
Commercial other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	1	3	3
Pre-Modification Recorded Investment	$ 105	$ 86	$ 1,186	$ 313
Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment			0	34
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method			$ 0	$ 0
Number of Loans | loan	13	7	15	7
Pre-Modification Recorded Investment	$ 3,330	$ 5,445	$ 4,391	$ 5,445
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,306	$ 5,445	$ 4,368	$ 5,445
Agricultural other [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	6	4	7	4
Pre-Modification Recorded Investment	$ 1,770	$ 1,349	$ 1,868	$ 1,349
Agricultural other [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	3	8	3
Pre-Modification Recorded Investment	$ 1,560	$ 4,096	$ 2,523	$ 4,096
Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,747	8,385	7,785	8,403
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 16	$ 83	$ 90	$ 166
Number of Loans | loan	5	3	7	3
Pre-Modification Recorded Investment	$ 327	$ 255	$ 493	$ 255
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 327	$ 255	$ 493	$ 255
Residential real estate senior liens [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1	0
Pre-Modification Recorded Investment	$ 56	$ 0	$ 56	$ 0
Residential real estate senior liens [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	3	6	3
Pre-Modification Recorded Investment	$ 271	$ 255	$ 437	$ 255
Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	30	77	35	76
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	$ 1	$ 0	$ 1
Number of Loans | loan	0	0	0	1
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 8
Residential real estate junior liens [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	1
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 8
Residential real estate junior liens [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential, Home Equity Line Of Credit, Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	35	0	18
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		$ 0	$ 0	$ 0
Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	3	7	4
Pre-Modification Recorded Investment	$ 327	$ 255	$ 493	$ 263
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 327	$ 255	$ 493	$ 263
Total residential real estate [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1	1
Pre-Modification Recorded Investment	$ 56	$ 0	$ 56	$ 8
Total residential real estate [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	3	6	3
Pre-Modification Recorded Investment	$ 271	$ 255	$ 437	$ 255
Consumer Unsecured Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer Unsecured Financing Receivable [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer Unsecured Financing Receivable [Member] | Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0

Loans and ALLL (Summary of TDR

Loans and ALLL (Summary of TDR loan balances) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Troubled debt restructurings	$ 27,801	$ 26,197

Equity Securities Without Rea48

Equity Securities Without Readily Determinable Fair Values (Equity securities without readily determinable fair values) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Equity Method And Other Investments [Abstract]
FHLB Stock	$ 13,925	$ 13,700
FRB Stock	1,999	1,999
Other	334	334
Total	23,743	23,454
Investment in Corporate Settlement Solutions [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 7,485	$ 7,421

Borrowed Funds (Borrowed funds

Borrowed Funds (Borrowed funds obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Debt [Line Items]
Borrowed funds	$ 362,496		$ 362,496		$ 344,878
Borrowed funds, Rate	1.92%		1.92%		1.65%
Securities Sold under Agreements to Repurchase [Member]
Schedule of Debt [Line Items]
Short-term Debt, Maximum Month-end Outstanding Amount	$ 34,242	$ 55,731	$ 38,967	$ 61,131
Borrowed funds	$ 31,296		$ 31,296		$ 54,878
Borrowed funds, Rate	0.10%		0.10%		0.12%
Federal Funds Purchased [Member]
Schedule of Debt [Line Items]
Short-term Debt, Maximum Month-end Outstanding Amount	$ 16,200	$ 5,965	$ 16,200	$ 27,300
Borrowed funds	$ 16,200		$ 16,200		$ 0
Borrowed funds, Rate	2.14%		2.14%		0.00%
Federal Home Loan Bank Advances [Member]
Schedule of Debt [Line Items]
Borrowed funds	$ 315,000		$ 315,000		$ 290,000
Borrowed funds, Rate	2.09%		2.09%		1.94%

Borrowed Funds (Maturity and we

Borrowed Funds (Maturity and weighted average interest rates of FHLB advances) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.09%	1.94%
FHLB advances	$ 315,000	$ 290,000
Fixed Rate Advances Due 2018 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.90%	1.96%
FHLB fixed rate advances	$ 40,000	$ 70,000
Fixed Rate Advances Due 2019 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.94%	1.87%
FHLB fixed rate advances	$ 100,000	$ 85,000
Fixed Rate Advances Due 2020 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.18%	1.80%
FHLB fixed rate advances	$ 55,000	$ 35,000
Fixed Rate Advances Due 2021 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.91%	1.91%
FHLB fixed rate advances	$ 50,000	$ 50,000
Federal Home Loan Bank, Advances, Variable Rate Due 2021 [Member] [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Floating Rate	$ 10,000	$ 10,000
FHLB advances, rate	2.63%	1.72%
Federal Home Loan Bank, Advances, Fixed Rate Due 2022 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.97%	1.97%
FHLB fixed rate advances	$ 20,000	$ 20,000
Fixed Rate Advances Due 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	3.36%	3.90%
FHLB fixed rate advances	$ 20,000	$ 10,000
Federal Home Loan Bank, Advances, Fixed Rate Due 2024 [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.97%	0.00%
FHLB fixed rate advances	$ 10,000	$ 0
Federal Home Loan Bank, Advances, Fixed Rate Due 2026 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.17%	1.17%
FHLB fixed rate advances	$ 10,000	$ 10,000

Borrowed Funds (Short-term borr

Borrowed Funds (Short-term borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 34,242	$ 55,731	$ 38,967	$ 61,131
Average Balance	$ 32,957	$ 53,841	$ 34,467	$ 55,663
Weighted Average Interest Rate During the Period	0.09%	0.13%	0.09%	0.13%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 16,200	$ 5,965	$ 16,200	$ 27,300
Average Balance	$ 9,199	$ 7,496	$ 6,843	$ 4,197
Weighted Average Interest Rate During the Period	1.82%	1.13%	1.77%	1.11%
Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 0	$ 0	$ 0	$ 0
Average Balance	$ 0	$ 88	$ 0	$ 44
Weighted Average Interest Rate During the Period	0.00%	1.48%	0.00%	1.48%

Borrowed Funds (Pledged financi

Borrowed Funds (Pledged financial instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Pledged to secure borrowed funds	$ 423,968	$ 410,988
Pledged to secure repurchase agreements	31,315	54,898
Pledged for public deposits and for other purposes necessary or required by law	34,386	27,976
Total	489,669	493,862
Short-term Debt [Line Items]
AFS securities pledged without single maturity dates	31,315	54,898
State and Local Funds Purchased [Member]
Short-term Debt [Line Items]
AFS securities pledged without single maturity dates	3,346	7,332
Mortgage Backed Securities, Other [Member]
Short-term Debt [Line Items]
AFS securities pledged without single maturity dates	6,537	13,199
Collateralized Mortgage Obligations [Member]
Short-term Debt [Line Items]
AFS securities pledged without single maturity dates	$ 21,432	$ 34,367

Borrowed Funds (Derivatives) (D

Borrowed Funds (Derivatives) (Details) - Cash Flow Hedging [Member] - Interest Rate Swaps [Member] - Designated as Hedging Instrument [Member] - London Interbank Offered Rate (LIBOR) [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Pay Rate	1.56%	1.56%
Remaining Life (Years)	2 years 8 months	3 years 4 months
Notional Amount	$ 10,000	$ 10,000
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 444	$ 291

Borrowed Funds (Narrative) (Det

Borrowed Funds (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Carrying value of securities sold under agreements to repurchase	$ 31,315	$ 54,898
Short-term Debt [Line Items]
Additional borrowing capacity	$ 112,113
Federal Funds Purchased [Member] | Minimum [Member]
Short-term Debt [Line Items]
Debt instrument, term	1 day
Federal Funds Purchased [Member] | Maximum [Member]
Short-term Debt [Line Items]
Debt instrument, term	4 days

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,311	$ 1,346	$ 2,642	$ 2,532
Debit card income [Member]
Disaggregation of Revenue [Line Items]
Revenue	621	594	1,209	1,124
Trust service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue	434	500	936	911
Brokerage advisory fees [Member]
Disaggregation of Revenue [Line Items]
Revenue	174	166	330	326
Service charges and fees related to deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 82	$ 86	$ 167	$ 171

Other Noninterest Expenses (Exp

Other Noninterest Expenses (Expenses included in other noninterest expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summary of expenses included in other noninterest expenses
ATM and Debit Card Expense	$ 234	$ 404	$ 466	$ 620
Professional Fees, Audit And Related	258	237	460	435
Directors fees	222	213	431	422
Professional Fees, Consulting	359	208	609	413
Expense Related to Distribution or Servicing and Underwriting Fees	165	192	314	309
FDIC insurance premiums	156	155	320	308
Donations and community relations	210	168	361	298
Postage and freight	91	110	222	219
Marketing Expense	149	100	259	189
Education and travel	101	93	216	189
Printing and supplies expense	145	103	205	210
All other	637	540	1,163	1,124
Total other	$ 2,727	$ 2,523	$ 5,026	$ 4,736

Federal Income Taxes (Details)

Federal Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	34.00%	21.00%	34.00%
Income taxes at 34% statutory rate	$ 755	$ 1,612	$ 1,538	$ 2,859
Interest income on tax exempt municipal securities	(264)	(454)	(538)	(909)
Earnings on corporate owned life insurance policies	(38)	(62)	(74)	(123)
Effect of tax credits	(201)	(191)	(401)	(380)
Other	(8)	(18)	(19)	(36)
Total effect of nontaxable income	(511)	(725)	(1,032)	(1,448)
Effect of nondeductible expenses	19	11	22	19
Federal income tax expense	$ 263	$ 898	$ 528	$ 1,430

Computation of Earnings Per C58

Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,912,374	7,841,822	7,887,961	7,834,523
Average potential effect of common shares in the Directors Plan	[1]	173,222	190,528	186,174	191,028
Average number of common shares outstanding used to calculate diluted earnings per common share		8,085,596	8,032,350	8,074,135	8,025,551
Net income		$ 3,333	$ 3,844	$ 6,795	$ 6,980
Basic (in dollars per share)		$ 0.42	$ 0.49	$ 0.86	$ 0.89
Diluted (in dollars per share)		$ 0.41	$ 0.48	$ 0.84	$ 0.87
[1]	Exclusive of shares held in the Rabbi Trust

Accumulated Other Comprehensi59

Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (8,656)	$ (1,540)	$ (2,602)	$ (2,778)
OCI before reclassifications	(1,947)	2,509	(9,882)	4,203
Amounts reclassified from AOCI	0	(142)	0	(142)
Other Comprehensive Income (Loss), before Tax	(1,947)	2,367	(9,882)	4,061
Tax effect	436	(741)	2,094	(1,197)
Unrealized gains (losses), net of tax	(1,511)	1,626	(7,788)	2,864
Cumulative Effect of New Accounting Principle in Period of Adoption	0		0
Ending Balance	(10,167)	86	(10,167)	86
ASU 2016-01 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	223	0	223	0
Unrealized Holding Gains (Losses) on AFS Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,759)	1,257	391	30
OCI before reclassifications	(1,978)	2,570	(10,035)	4,247
Amounts reclassified from AOCI	0	(142)	0	(142)
Other Comprehensive Income (Loss), before Tax	(1,978)	2,428	(10,035)	4,105
Tax effect	442	(762)	2,126	(1,212)
Unrealized gains (losses), net of tax	(1,536)	1,666	(7,909)	2,893
Ending Balance	(7,295)	2,923	(7,295)	2,923
Unrealized Holding Gains (Losses) on AFS Securities [Member] | ASU 2016-01 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	223	0	223	0
Defined Benefit Pension Plan [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,223)	(2,972)	(3,223)	(2,972)
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	0	0
Tax effect	0	0	0	0
Unrealized gains (losses), net of tax	0	0	0	0
Ending Balance	(3,223)	(2,972)	(3,223)	(2,972)
Defined Benefit Pension Plan [Member] | ASU 2016-01 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	0	0	0	0
Gain (Loss) on Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	326	175	230	164
OCI before reclassifications	31	(61)	153	(44)
Amounts reclassified from AOCI	0	0	0	0
Other Comprehensive Income (Loss), before Tax	31	(61)	153	(44)
Tax effect	(6)	21	(32)	15
Unrealized gains (losses), net of tax	25	(40)	121	(29)
Ending Balance	351	135	351	135
Gain (Loss) on Derivative Instruments [Member] | ASU 2016-01 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	0	0	0	0
Auction Rate Money Market Preferred Stocks [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Unrealized gains (losses), net of tax	$ 123	$ 186	$ 86	$ 541

Accumulated Other Comprehensi60

Accumulated Other Comprehensive Income (Loss) (Components of unrealized holding gains on AFS securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period	$ (1,978)	$ 2,570	$ (10,035)	$ 4,247
Reclassification adjustment for net (gains) losses included in net income	0	(142)	0	(142)
Tax effect	442	(762)	2,126	(1,212)
Unrealized gains (losses), net of tax	(1,511)	1,626	(7,788)	2,864
Unrealized Holding Gains (Losses) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period	(1,978)	2,570	(10,035)	4,247
Reclassification adjustment for net (gains) losses included in net income	0	(142)	0	(142)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	(1,978)	2,428	(10,035)	4,105
Tax effect	442	(762)	2,126	(1,212)
Unrealized gains (losses), net of tax	(1,536)	1,666	(7,909)	2,893
Unrealized Holding Gains (Losses) on AFS Securities [Member] | Auction Rate Money Market Preferred and Preferred Stocks [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period	123	186	86	541
Reclassification adjustment for net (gains) losses included in net income	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	123	186	86	541
Tax effect	0	0	0	0
Unrealized gains (losses), net of tax	123	186	86	541
Unrealized Holding Gains (Losses) on AFS Securities [Member] | All Other AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period	(2,101)	2,384	(10,121)	3,706
Reclassification adjustment for net (gains) losses included in net income	0	(142)	0	(142)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	(2,101)	2,242	(10,121)	3,564
Tax effect	442	(762)	2,126	(1,212)
Unrealized gains (losses), net of tax	(1,659)	1,480	(7,995)	2,352
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses), net of tax	$ 0	$ 0	$ 0	$ 0

Fair Value (Quantitative inform

Fair Value (Quantitative information about impaired loans) (Details) - Discounted appraisal value [Member] - Level 3 [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discounted appraisal value at fair value	$ 28,624	$ 15,956
Loans Receivable, Collateralized By Livestock [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Real Estate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Real Estate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Equipment [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Equipment [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	40.00%	35.00%
Loans Receivable, Collateralized By Accounts Receivable [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount		50.00%
Loans Receivable, Collateralized By Accounts Receivable [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	25.00%
Loans Receivable, Collateralized By Accounts Receivable [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	50.00%
Cash crop inventory [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Cash crop inventory [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	40.00%	40.00%
Loans Receivable, Collateralized By Other Inventory [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	50.00%	50.00%
Loans Receivable, Collateralized By Other Inventory [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	75.00%	75.00%
Liquor License [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	75.00%	75.00%
Furniture and Fixtures [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	35.00%	35.00%
Furniture and Fixtures [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	45.00%	45.00%

Fair Value (Quantitative info62

Fair Value (Quantitative information related to foreclosed assets) (Details) - Discounted appraisal value [Member] - Level 3 [Member] - Real Estate [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%

Fair Value (Carrying amount and

Fair Value (Carrying amount and estimated fair value of financial instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Level 1 [Member]
ASSETS
Cash and cash equivalents		$ 22,213	$ 30,848
Mortgage loans AFS		0	0
Total loans		0	0
Less allowance for loan losses		0	0
Net loans		0	0
Accrued interest receivable		5,684	7,063
Equity securities without readily determinable fair values	[1]	0	0
Originated mortgage servicing rights		0	0
LIABILITIES
Deposits without stated maturities		821,442	811,992
Deposits with stated maturities		0	0
Borrowed funds		0	0
Accrued interest payable		702	680
Level 2 [Member]
ASSETS
Cash and cash equivalents		0	0
Mortgage loans AFS		1,440	1,587
Total loans		0	0
Less allowance for loan losses		0	0
Net loans		0	0
Accrued interest receivable		0	0
Equity securities without readily determinable fair values	[1]	0	0
Originated mortgage servicing rights		2,400	2,409
LIABILITIES
Deposits without stated maturities		0	0
Deposits with stated maturities		441,266	443,892
Borrowed funds		357,079	342,089
Accrued interest payable		0	0
Level 3 [Member]
ASSETS
Cash and cash equivalents		0	0
Mortgage loans AFS		0	0
Total loans		1,151,688	1,056,906
Less allowance for loan losses		8,200	7,700
Net loans		1,143,488	1,049,206
Accrued interest receivable		0	0
Equity securities without readily determinable fair values	[1]	0	0
Originated mortgage servicing rights		0	0
LIABILITIES
Deposits without stated maturities		0	0
Deposits with stated maturities		0	0
Borrowed funds		0	0
Accrued interest payable		0	0
Carrying Value [Member]
ASSETS
Cash and cash equivalents		22,213	30,848
Mortgage loans AFS		1,420	1,560
Total loans		1,151,756	1,091,519
Less allowance for loan losses		8,200	7,700
Net loans		1,143,556	1,083,819
Accrued interest receivable		5,684	7,063
Equity securities without readily determinable fair values	[1]	23,743	23,454
Originated mortgage servicing rights		2,398	2,409
LIABILITIES
Deposits without stated maturities		821,442	811,992
Deposits with stated maturities		453,320	453,266
Borrowed funds		362,496	344,878
Accrued interest payable		702	680
Estimated Fair Value [Member]
ASSETS
Cash and cash equivalents		22,213	30,848
Mortgage loans AFS		1,440	1,587
Total loans		1,151,688	1,056,906
Less allowance for loan losses		8,200	7,700
Net loans		1,143,488	1,049,206
Accrued interest receivable		5,684	7,063
Originated mortgage servicing rights		2,400	2,409
LIABILITIES
Deposits without stated maturities		821,442	811,992
Deposits with stated maturities		441,266	443,892
Borrowed funds		357,079	342,089
Accrued interest payable		$ 702	$ 680
[1]	Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment.

Fair Value (Recorded amount of

Fair Value (Recorded amount of assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
AFS Securities
AFS securities	$ 524,108	$ 548,730
Available-for-sale Securities, Equity Securities	0	3,577
Fair value, total	553,176	568,554
Level 1 [Member]
AFS Securities
Fair value, total	$ 0	$ 3,577
Percent of assets and liabilities measured at fair value	0.00%	0.63%
Level 2 [Member]
AFS Securities
Fair value, total	$ 524,552	$ 549,021
Percent of assets and liabilities measured at fair value	94.83%	96.56%
Level 3 [Member]
AFS Securities
Fair value, total	$ 28,624	$ 15,956
Percent of assets and liabilities measured at fair value	5.17%	2.81%
Recurring items [Member]
AFS Securities
AFS securities	$ 524,108	$ 548,730
Available-for-sale Securities, Equity Securities	0	3,577
Derivative instruments	(444)	291
Recurring items [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	190	216
Recurring items [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	202,273	208,474
Recurring items [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	3,135	3,049
Recurring items [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	197,637	208,797
Recurring items [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	120,873	128,194
Recurring items [Member] | Level 1 [Member]
AFS Securities
AFS securities	0	0
Available-for-sale Securities, Equity Securities	0	3,577
Derivative instruments	0	0
Recurring items [Member] | Level 1 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 1 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 2 [Member]
AFS Securities
AFS securities	524,108	548,730
Available-for-sale Securities, Equity Securities	0	0
Derivative instruments	444	291
Recurring items [Member] | Level 2 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	190	216
Recurring items [Member] | Level 2 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	202,273	208,474
Recurring items [Member] | Level 2 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	3,135	3,049
Recurring items [Member] | Level 2 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	197,637	208,797
Recurring items [Member] | Level 2 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	120,873	128,194
Recurring items [Member] | Level 3 [Member]
AFS Securities
AFS securities	0	0
Available-for-sale Securities, Equity Securities	0	0
Derivative instruments	0	0
Recurring items [Member] | Level 3 [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	0	0
Recurring items [Member] | Level 3 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	0	0
Nonrecurring items [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	28,624	15,956
Nonrecurring items [Member] | Level 1 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Nonrecurring items [Member] | Level 2 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Nonrecurring items [Member] | Level 3 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	$ 28,624	$ 15,956

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details Textual) - Level 3 [Member]	6 Months Ended
	Jun. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairments recorded on equity securities without readily determinable fair values	$ 0
Impairments recorded on goodwill and other acquisition intangibles	$ 0

Parent Company Only Financial66

Parent Company Only Financial Information (Interim Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
ASSETS
AFS securities	$ 524,108
Premises and equipment	28,267	$ 28,450
Other assets	12,090	10,056
TOTAL ASSETS	1,836,955	1,813,130
LIABILITIES AND SHAREHOLDERS' EQUITY
Shareholders' equity	191,949	194,905	$ 195,070	$ 187,899
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,836,955	1,813,130
Parent Company [Member]
ASSETS
Cash on deposit at subsidiary Bank	3,008	185
Investments in subsidiaries	140,413	145,962
Premises and equipment	1,902	1,950
Other assets	51,234	52,253
TOTAL ASSETS	196,557	200,350
LIABILITIES AND SHAREHOLDERS' EQUITY
Other liabilities	4,608	5,445
Shareholders' equity	191,949	194,905
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 196,557	$ 200,350

Parent Company Only Financial67

Parent Company Only Financial Information (Interim Condensed Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Expenses
Compensation and benefits	$ 5,679	$ 4,817	$ 11,173	$ 10,374
Occupancy and equipment	807	815	1,631	1,652
ProfesDonations and community relations	258	237	460	435
Other	2,727	2,523	5,026	4,736
Federal income tax benefit	(263)	(898)	(528)	(1,430)
Net income	3,333	3,844	6,795	6,980
Parent Company [Member]
Income
Dividends from subsidiaries	3,900	2,600	6,000	4,300
Interest income	0	0	0	2
Management fee and other	855	1,691	1,530	3,241
Total income	4,755	4,291	7,530	7,543
Expenses
Compensation and benefits	1,175	1,118	2,159	2,490
Occupancy and equipment	126	432	249	876
ProfesDonations and community relations	104	140	173	264
Other	380	634	774	1,175
Total expenses	1,785	2,324	3,355	4,805
Income before income tax benefit and equity in undistributed earnings of subsidiaries	2,970	1,967	4,175	2,738
Federal income tax benefit	192	212	380	528
Income before equity in undistributed earnings of subsidiaries	3,162	2,179	4,555	3,266
Undistributed earnings of subsidiaries	171	1,665	2,240	3,714
Net income	$ 3,333	$ 3,844	$ 6,795	$ 6,980

Parent Company Only Financial68

Parent Company Only Financial Information (Interim Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 3,333	$ 3,844	$ 6,795	$ 6,980
Adjustments to reconcile net income to cash provided by operations
Share-based payment awards			304	302
Depreciation			1,448	1,440
Changes in operating assets and liabilities which used cash
Other assets			(353)	(1,734)
Accrued interest and other liabilities			(341)	(382)
Net cash provided by (used in) operating activities			10,945	8,687
Investing activities
Sales (purchases) of premises and equipment			(1,265)	(805)
Net cash provided by (used in) investing activities			(44,435)	(45,130)
Financing activities
Cash dividends paid on common stock			(4,096)	(3,920)
Proceeds from the issuance of common stock			3,272	3,764
Common stock repurchased			(1,238)	(2,622)
Common stock purchased for deferred compensation obligations			(205)	(197)
Net cash provided by (used in) financing activities			24,855	35,383
Increase (decrease) in cash and cash equivalents			(8,635)	(1,060)
Cash and cash equivalents at beginning of period			30,848	22,894
Cash and cash equivalents at end of period	22,213	21,834	22,213	21,834
Parent Company [Member]
Operating activities
Net income	3,333	3,844	6,795	6,980
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries			(2,240)	(3,714)
Undistributed earnings of equity securities without readily determinable fair values			(64)	93
Share-based payment awards			304	302
Depreciation			64	77
Changes in operating assets and liabilities which used cash
Other assets			1,084	80
Accrued interest and other liabilities			(837)	(1,219)
Net cash provided by (used in) operating activities			5,106	2,599
Investing activities
Maturities, calls, principal payments, and sales of AFS securities			0	249
Sales (purchases) of premises and equipment			(16)	(26)
Net cash provided by (used in) investing activities			(16)	223
Financing activities
Cash dividends paid on common stock			(4,096)	(3,920)
Proceeds from the issuance of common stock			3,272	3,764
Common stock repurchased			(1,238)	(2,622)
Common stock purchased for deferred compensation obligations			(205)	(197)
Net cash provided by (used in) financing activities			(2,267)	(2,975)
Increase (decrease) in cash and cash equivalents			2,823	(153)
Cash and cash equivalents at beginning of period			185	1,297
Cash and cash equivalents at end of period	$ 3,008	$ 1,144	$ 3,008	$ 1,144

Operating Segments (Narrative)

Operating Segments (Narrative) (Details)	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting [Abstract]
Percentage of reportable segments total assets and operating results, or more	90.00%	90.00%