County Bancorp (ICBK) 10-Q 8 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 08, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	County Bancorp, Inc.
Entity Central Index Key	1,470,205
Trading Symbol	ICBK
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
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
Entity Common Stock, Shares Outstanding		6,695,822

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 81,044	$ 66,771
Securities available-for-sale, at fair value	187,505	126,030
FHLB Stock, at cost	3,354	4,138
Loans held for sale	11,468	6,575
Loans, net of allowance for loan losses of $15,129 as of June 30, 2018; $13,247 as of December 31, 2017	1,166,395	1,135,704
Premises and equipment, net	14,567	9,662
Loan servicing rights	9,087	8,950
Other real estate owned, net	9,004	4,962
Cash surrender value of bank owned life insurance	17,614	17,389
Deferred tax asset, net	4,403	3,265
Goodwill	5,038	5,038
Accrued interest receivable and other assets	8,697	7,642
Total assets	1,518,877	1,397,045
Deposits:
Noninterest-bearing	95,459	125,584
Interest-bearing	1,114,972	984,493
Total deposits	1,210,431	1,110,077
Other borrowings	841	1,299
Advances from FHLB	108,200	121,500
Subordinated debentures	44,725	15,523
Accrued interest payable and other liabilities	8,598	7,660
Total liabilities	1,372,795	1,256,059
SHAREHOLDERS' EQUITY
Preferred stock-variable rate, non-cumulative, nonparticipating, $1,000 stated value; 15,000 shares authorized; 8,000 shares issued at June 30, 2018 and December 31, 2017	8,000	8,000
Common stock - $0.01 par value; 50,000,000 authorized; 7,135,549 shares issued and 6,693,447 shares outstanding at June 30, 2018; 7,112,962 shares issued and 6,673,381 shares outstanding at December 31, 2017	28	28
Surplus	52,696	52,230
Retained earnings	93,282	86,385
Treasury stock, at cost; 442,102 shares at June 30, 2018; 439,581 shares at December 31, 2017	(5,030)	(5,030)
Accumulated other comprehensive loss	(2,894)	(627)
Total shareholders' equity	146,082	140,986
Total liabilities and shareholders' equity	1,518,877	1,397,045
Core Deposit
ASSETS
Core deposit intangible, net of accumulated amortization of $1,100 as of June 30, 2018; $882 as of December 31, 2017	$ 701	$ 919

CONSOLIDATED BALANCE SHEETS (U3

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Allowance for loan losses	$ 15,129	$ 13,247
Preferred Stock, stated value	$ 1,000	$ 1,000
Preferred Stock, shares authorized	15,000	15,000
Preferred Stock, shares issued	8,000	8,000
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	50,000,000	50,000,000
Common Stock, shares issued	7,135,549	7,112,962
Common Stock, shares outstanding	6,693,447	6,673,381
Treasury Stock, shares	442,102	439,581
Core Deposit
Core deposit intangible, amortization	$ 1,100	$ 882

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 14,366	$ 12,328	$ 28,057	$ 23,882
Taxable securities	982	460	1,614	885
Tax-exempt securities	14	83	171	180
Federal funds sold and other	401	81	614	141
Total interest and dividend income	15,763	12,952	30,456	25,088
INTEREST EXPENSE
Deposits	4,600	2,806	8,396	5,243
FHLB advances and other borrowed funds	487	464	971	845
Subordinated debentures	338	125	481	245
Total interest expense	5,425	3,395	9,848	6,333
Net interest income	10,338	9,557	20,608	18,755
Provision for loan losses	533	1,524	630	2,285
Net interest income after provision for loan losses	9,805	8,033	19,978	16,470
NON-INTEREST INCOME
Gain on sale of loans, net	45	24	77	49
Other	213	163	394	324
Total non-interest income	2,316	1,856	4,356	3,572
NON-INTEREST EXPENSE
Employee compensation and benefits	4,114	3,833	8,332	7,890
Occupancy	278	180	482	357
Information processing	529	397	994	759
Write-down of other real estate owned	104	78	104	78
Other	1,912	2,153	3,810	3,452
Total non-interest expense	6,937	6,641	13,722	12,536
Income before income taxes	5,184	3,248	10,612	7,506
Income tax expense	1,334	1,190	2,708	2,816
NET INCOME	$ 3,850	$ 2,058	$ 7,904	$ 4,690
NET INCOME PER SHARE:
Basic	$ 0.56	$ 0.30	$ 1.15	$ 0.68
Diluted	0.55	0.29	1.14	0.68
Dividends paid per share	$ 0.07	$ 0.06	$ 0.14	$ 0.12
Services Charges
NON-INTEREST INCOME
Non-interest income	$ 445	$ 399	$ 810	$ 724
Loan Servicing Fees
NON-INTEREST INCOME
Non-interest income	$ 1,613	$ 1,270	$ 3,075	$ 2,475

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,850	$ 2,058	$ 7,904	$ 4,690
Other comprehensive income:
Unrealized gain (loss) on securities available-for-sale	(373)	246	(2,772)	579
Income tax benefit (expense)	80	(96)	594	(226)
Total other comprehensive income (loss) on securities available-for-sale	(293)	150	(2,178)	353
Unrealized gain on derivatives arising during the period	51		51
Income tax benefit	(14)		(14)
Total other comprehensive gain on derivatives	37		37
Total other comprehensive income (loss)	(256)	150	(2,141)	353
Comprehensive income	$ 3,594	$ 2,208	$ 5,763	$ 5,043

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2016	$ 131,288	$ 8,000	$ 26	$ 50,553	$ 77,907	$ (4,828)	$ (370)
Net income	4,690				4,690
Other comprehensive income (loss)	353						353
Stock compensation expense, net of tax	239			239
Cash dividends declared on common stock	(795)				(795)
Cash dividends declared on preferred stock	(166)				(166)
Proceeds from exercise of common stock options	645		1	644
Balance at Jun. 30, 2017	136,254	8,000	27	51,436	81,636	(4,828)	(17)
Balance at Dec. 31, 2017	140,986	8,000	28	52,230	86,385	(5,030)	(627)
Net income	7,904				7,904
Other comprehensive income (loss)	(2,141)						(2,141)
Stock compensation expense, net of tax	259			259
Cash dividends declared on common stock	(937)				(937)
Cash dividends declared on preferred stock	(196)				(196)
Reclassification of stranded tax effects of rate change					126		(126)
Proceeds from exercise of common stock options	207			207
Balance at Jun. 30, 2018	$ 146,082	$ 8,000	$ 28	$ 52,696	$ 93,282	$ (5,030)	$ (2,894)

CONSOLIDATED STATEMENTS OF STO7

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement Of Stockholders Equity [Abstract]
Options, exercised	12,592	48,584

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 7,904	$ 4,690
Adjustments to reconcile net income to cash provided by (used for) operating activities:
Depreciation and amortization of premises and equipment	560	485
Amortization of core deposit intangible	218	276
Amortization of subordinated debentures discount	34	36
Provision for loan losses	630	2,285
Realized gain on sales of other real estate owned	(149)	(402)
Write-down of other real estate owned	104	78
Realized loss (gain) on sales of premises and equipment	1	(290)
Increase in cash surrender value of bank owned life insurance	(225)	(211)
Deferred income tax benefit	(373)	(613)
Stock compensation expense, net	259	239
Net amortization of securities	445	473
Net change in:
Accrued interest receivable and other assets	(1,057)	(222)
Loans held for sale	(4,893)	(6,874)
Loan servicing rights	(137)	371
Accrued interest payable and other liabilities	839	(1,879)
Net cash provided by (used for) operating activities	4,158	(978)
Cash flows from investing activities
Proceeds from maturities, principal repayments, and call of securities available for sale	11,958	18,034
Purchases of securities available-for-sale	(76,684)	(9,636)
Redemption of FHLB stock	784	1,154
Purchases of bank owned life insurance		(5,500)
Loan originations and principal collections, net	(37,425)	(51,121)
Proceeds from sales of premises and equipment		1,615
Purchases of premises and equipment	(5,464)	(1,911)
Proceeds from sales of other real estate owned	2,107	1,079
Net cash used in investing activities	(104,724)	(46,286)
Cash flows from financing activities
Net decrease in demand and savings deposits	(27,247)	(59,849)
Net increase in certificates of deposits	127,602	75,993
Net change in other borrowings	(458)	(709)
Proceeds from FHLB advances	63,000	157,660
Repayment of FHLB advances	(76,300)	(132,255)
Proceeds from issuance of subordinated debt	29,168
Proceeds from issuance of common stock	207	645
Dividends paid on preferred stock	(196)	(166)
Dividends paid on common stock	(937)	(795)
Net cash provided by financing activities	114,839	40,524
Net change in cash and cash equivalents	14,273	(6,740)
Cash and cash equivalents, beginning of period	66,771	42,679
Cash and cash equivalents, end of period	81,044	35,939
Cash paid during the period for:
Interest	9,538	6,143
Income taxes	1,975	4,775
Noncash investing activities:
Transfer from loans to other real estate owned	6,104	4,512
Loans charged off	$ 42	$ 1,492

BASIS OF PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
BASIS OF PRESENTATION	NOTE 1 – BASIS OF PRESENTATION The unaudited consolidated financial statements of County Bancorp, Inc. (“we,” “us,” ”our,” or the “Company”) and its subsidiaries, including Investors Community Bank (the “Bank”), have been prepared, in the opinion of management, to reflect all adjustments necessary for a fair presentation of the financial position, results of operations, and cash flows as of and for the three and six months ended June 30, 2018. The results of operations for the three and six months ended June 30, 2018 may not necessarily be indicative of the results to be expected for the year ending December 31, 2018, or for any other period. Management of the Company is required to make estimates and assumptions which affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of income and expenses during the reported periods. Actual results could differ significantly from those estimates. These unaudited interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”). Certain information in footnote disclosure normally included in financial statements prepared in accordance with GAAP has been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The Company qualifies as an “emerging growth company” under the Jumpstart Our Business Startups Act (the “JOBS Act”). Section 107 of the JOBS Act provides that an emerging growth company can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the “Securities Act”), for complying with new or revised accounting standards. As an emerging growth company, the Company can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. The Company elected to take advantage of the benefits of this extended transition period. Significant Accounting Policies Derivative Instruments. Derivative instruments, classified on the balance sheet as an other asset, represent contracts between parties that usually require little or no initial net investment and result in one party delivering cash to the other party based on a notional amount and an underlying variable, as specified in the contract, and may be subject to master netting agreements. During the second quarter of 2018, the Company executed an interest rate swap to manage interest rate risk on two sets of its trust preferred securities. This derivative contract involves the receipt of floating rate interest from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. This instrument is designated as a cash flow hedge as the receipt of floating rate interest from the counterparty is used to manage interest rate risk associated with three month LIBOR advances. The change in the fair value of this hedging instrument is recorded in accumulated other comprehensive income, net of taxes, and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings while the ineffective portion of changes in the fair value of the derivative, if any, is recognized immediately in other noninterest income. The Company assesses the effectiveness of the hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instrument with the cumulative changes in cash flows of the designated hedged item or transaction. New Accounting Pronouncements In April 2016, the Financial Accounting Standards Board (the “FASB”) issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses In March 2017, the FASB issued updated guidance codified within ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs In May 2017, the FASB issued updated guidance codified within ASU No. 2017-09, Compensation – Stock Compensation . In July 2017, the FASB issued ASU No. 2017-11, Earnings Per Share – Accounting for Certain Financial Instruments with Down Round Features In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815) In September 2017, the FASB issued updated guidance codified within ASU No. 2017-13, Revenue Recognition, Revenue from Contracts with Customers, Leases (Topic 840), and Leases (Topic 842) Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers Revenue from Contracts with Customers In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In June 2018, the FASB issued ASU 2018-07, Stock Compensation – Improvements to Nonemployee Share-Based Payment Accounting

EARNINGS PER SHARE

EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 2 – EARNINGS PER SHARE Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding during the applicable period. Diluted earnings per share is computed using the weighted-average number of shares determined for the basic earnings per common share plus the dilutive effect of share-based compensation using the treasury stock method. For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Net income from continuing operations $ 3,850 $ 2,058 $ 7,904 $ 4,690 Less: preferred stock dividends 99 85 196 166 Income available to common shareholders for basic earnings per common share $ 3,751 $ 1,973 $ 7,708 $ 4,524 Average number of common shares issued 7,351,985 7,328,282 7,349,923 7,323,885 Less: weighted average treasury shares 442,102 432,861 440,974 432,484 Less: weighted average nonvested equity incentive plan shares 219,315 266,186 224,550 278,810 Weighted average number of common shares outstanding 6,690,568 6,629,235 6,684,399 6,612,591 Effect of dilutive options 79,368 84,958 77,518 88,987 Weighted average number of common shares outstanding used to calculate diluted earnings per common share 6,769,936 6,714,193 6,761,917 6,701,578

SECURITIES AVAILABLE-FOR-SALE

SECURITIES AVAILABLE-FOR-SALE	6 Months Ended
	Jun. 30, 2018
Investments Debt And Equity Securities [Abstract]
SECURITIES AVAILABLE-FOR-SALE	NOTE 3 – SECURITIES AVAILABLE-FOR-SALE The amortized cost and fair value of securities available-for-sale as of June 30, 2018 and December 31, 2017 were as follows: Amortized Unrealized Unrealized Fair Cost Gains Losses Value (dollars in thousands) June 30, 2018 U.S. government and agency securities $ 4,599 $ — $ (46 ) $ 4,553 U.S. treasury securities 2,496 — (3 ) 2,493 Municipal securities 38,090 10 (728 ) 37,372 Mortgage-backed securities 146,162 98 (3,173 ) 143,087 $ 191,347 $ 108 $ (3,950 ) $ 187,505 December 31, 2017 U.S. government and agency securities $ 4,874 $ 82 $ — $ 4,956 Municipal securities 33,949 56 (240 ) 33,765 Mortgage-backed securities 88,242 64 (997 ) 87,309 $ 127,065 $ 202 $ (1,237 ) $ 126,030 The amortized cost and fair value of securities at June 30, 2018 and December 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Cost Value (dollars in thousands) June 30, 2018 Due in one year or less $ 8,799 $ 8,784 Due from one to five years 9,759 9,637 Due from five to ten years 8,502 8,367 Due after ten years 18,125 17,630 Mortgage-backed securities 146,162 143,087 $ 191,347 $ 187,505 December 31, 2017 Due in one year or less $ 7,990 $ 7,980 Due from one to five years 10,494 10,470 Due from five to ten years 11,482 11,494 Due after ten years 8,857 8,777 Mortgage-backed securities 88,242 87,309 $ 127,065 $ 126,030 There were no security sales for the six months ended June 30, 2018 and 2017. At June 30, 2018 and December 31, 2017, no securities were pledged to secure the Federal Home Loan Bank ( “FHLB” ) advances besides FHLB stock of $3.4 million and $4.1 million, respectively. At June 30, 2018 and December 31, 2017, the carrying amount of securities pledged to secure the Federal Reserve Bank Line of Credit was $0 and $8.6 million, respectively. The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temorarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2018 and December 31, 2017: Less Than 12 Months 12 Months or Greater Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses (dollars in thousands) June 30, 2018 U.S. government and agency securities $ 4,553 $ (46 ) $ — $ — $ 4,553 $ (46 ) U.S. treasury securities 2,493 (3 ) — — 2,493 (3 ) Municipal securities 32,976 (711 ) 899 (17 ) 33,875 (728 ) Mortgage-backed securities 102,839 (2,443 ) 14,631 (730 ) 117,470 (3,173 ) $ 142,861 $ (3,203 ) $ 15,530 $ (747 ) $ 158,391 $ (3,950 ) December 31, 2017 Municipal securities $ 25,280 $ (224 ) $ 1,354 $ (16 ) $ 26,634 $ (240 ) Mortgage-backed securities 54,278 (521 ) 16,466 (476 ) 70,744 (997 ) $ 79,558 $ (745 ) $ 17,820 $ (492 ) $ 97,378 $ (1,237 ) The unrealized losses on the investments at June 30, 2018 and December 31, 2017 was due to normal fluctuations and pricing inefficiencies. The contractual terms of the investments do not permit the issuers to settle the securities at a price less than the amortized cost basis of the investment. Because the Company does not intend to sell the investments and it is not more-likely-than-not that the Company will be required to sell the investments before recovery of the amortized cost basis, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired at June 30, 2018 and December 31, 2017.

LOANS

LOANS	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
LOANS	NOTE 4 – LOANS The components of loans were as follows: June 30, December 31, 2018 2017 (dollars in thousands) Agricultural loans $ 702,426 $ 686,430 Commercial real estate loans 289,184 292,704 Commercial loans 118,425 114,332 Residential real estate loans 71,150 55,138 Installment and consumer other 339 347 Total gross loans 1,181,524 1,148,951 Allowance for loan losses (15,129 ) (13,247 ) Net loans $ 1,166,395 $ 1,135,704 Changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018 and 2017 were as follows: Agricultural Commercial Real Estate Commercial Residential Real Estate Installment and Consumer Other Total (dollars in thousands) June 30, 2018 Balance, beginning of year $ 9,712 $ 1,978 $ 1,508 $ 47 $ 2 $ 13,247 Provision for loan losses 1,915 (1,284 ) 3 (3 ) (1 ) 630 Loans charged off — (42 ) — — — (42 ) Recoveries 1 1,251 41 — 1 1,294 Balance, end of period $ 11,628 $ 1,903 $ 1,552 $ 44 $ 2 $ 15,129 June 30, 2017 Balance, beginning of year $ 8,173 $ 2,762 $ 1,239 $ 470 $ 1 $ 12,645 Provision for loan losses 1,029 473 1,028 (246 ) 1 2,285 Loans charged off — (575 ) (917 ) — — (1,492 ) Recoveries 1 36 28 — — 65 Balance, end of period $ 9,203 $ 2,696 $ 1,378 $ 224 $ 2 $ 13,503 The following tables present the balances in the allowance for loan losses and the recorded balance in loans by portfolio segment and based on impairment method as of June 30, 2018 and December 31, 2017: June 30, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (dollars in thousands) Allowance for loan losses: Agricultural loans $ 2,855 $ 8,773 $ 11,628 Commercial real estate loans 10 1,893 1,903 Commercial loans 781 771 1,552 Residential real estate loans — 44 44 Installment and consumer other — 2 2 Total ending allowance for loan losses 3,646 11,483 15,129 Loans: Agricultural loans 42,838 659,588 702,426 Commercial real estate loans 2,366 286,818 289,184 Commercial loans 1,878 116,547 118,425 Residential real estate loans — 71,150 71,150 Installment and consumer other — 339 339 Total loans 47,082 1,134,442 1,181,524 Net loans $ 43,436 $ 1,122,959 $ 1,166,395 December 31, 2017 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (dollars in thousands) Allowance for loan losses: Agricultural loans $ 1,026 $ 8,686 $ 9,712 Commercial real estate loans — 1,978 1,978 Commercial loans 410 1,098 1,508 Residential real estate loans — 47 47 Installment and consumer other — 2 2 Total ending allowance for loan losses 1,436 11,811 13,247 Loans: Agricultural loans 28,744 657,686 686,430 Commercial real estate loans 2,465 290,239 292,704 Commercial loans 1,793 112,539 114,332 Residential real estate loans — 55,138 55,138 Installment and consumer other — 347 347 Total loans 33,002 1,115,949 1,148,951 Net loans $ 31,566 $ 1,104,138 $ 1,135,704 The following table presents the aging of the recorded investment in past due loans at June 30, 2018 and December 31, 2017: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Past Due Loans Not Past Due Total Loans (dollars in thousands) June 30, 2018 Agricultural loans $ 1,132 $ 780 $ 5,709 $ 7,621 $ 694,805 $ 702,426 Commercial real estate loans 2,385 — 2,366 4,751 284,433 289,184 Commercial loans — 731 1,089 1,820 116,605 118,425 Residential real estate loans — — — — 71,150 71,150 Installment and consumer other — — — — 339 339 Total $ 3,517 $ 1,511 $ 9,164 $ 14,192 $ 1,167,332 $ 1,181,524 December 31, 2017 Agricultural loans $ 476 $ — $ 6,819 $ 7,295 $ 679,135 $ 686,430 Commercial real estate loans — — 2,149 2,149 290,555 292,704 Commercial loans 1,064 — 642 1,706 112,626 114,332 Residential real estate loans — — — — 55,138 55,138 Installment and consumer other — — — — 347 347 Total $ 1,540 $ — $ 9,610 $ 11,150 $ 1,137,801 $ 1,148,951 The following table lists information on nonaccrual, restructured, and certain past due loans at June 30, 2018 and December 31, 2017: June 30, December 31, 2018 2017 (dollars in thousands) Nonaccrual loans, 90 days or more past due $ 9,164 $ 9,610 Nonaccrual loans 30-89 days past due 1,778 1,493 Nonaccrual loans, less than 30 days past due 15,363 456 Restructured loans not on nonaccrual status 11,173 9,019 90 days or more past due and still accruing — — Total $ 37,478 $ 20,578 The following table presents the average recorded investment and interest income recognized on impaired loans by portfolio segment for six months ended June 30, 2018 and 2017: For the Six Months Ended 2018 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (dollars in thousands) Agricultural loans $ 35,791 $ 1,417 $ 10,810 $ 113 Commercial real estate loans 2,416 6 4,392 60 Commercial loans 1,836 25 2,254 4 Residential real estate loans — — 34 — Total $ 40,042 $ 1,448 $ 17,490 $ 177 Impaired loans include nonaccrual loans, restructured loans, and loans that are 90 days or more past due and still accruing. For nonaccrual loans included in impaired loans, the interest income that would have been recognized had those loans been performing in accordance with their original terms would have been approximately $1.0 million and $0.5 million for the six months ended June 30, 2018 and 2017, respectively. Troubled Debt Restructurings The Company has allocated approximately $1.4 million and $0.9 million of specific reserves to customers whose loan terms have been modified in troubled debt restructurings (“TDR”) at June 30, 2018 and December 31, 2017, respectively. The Company had no additional lending commitments at June 30, 2018 or December 31, 2017 to customers with outstanding loans that are classified as TDRs. A TDR on nonaccrual status is classified as a nonaccrual loan until evaluation supports reasonable assurance of repayment and there has been a satisfactory period of performance according to the modified terms of the loan. Once this assurance is reached, the TDR is classified as a restructured loan. The following table presents the TDRs by loan class at June 30, 2018 and December 31, 2017: Non-Accrual Restructured and Accruing Total (dollars in thousands) June 30, 2018 Agricultural loans $ 6,136 $ 11,150 $ 17,286 Commercial real estate loans 323 — 323 Commercial loans — 23 23 Total $ 6,459 $ 11,173 $ 17,632 December 31, 2017 Agricultural loans $ 3,822 $ 8,668 $ 12,490 Commercial real estate loans 575 316 891 Commercial loans — 35 35 Total $ 4,397 $ 9,019 $ 13,416 The following table provides the number of loans modified in a troubled debt restructuring investment by class for the six months ended June 30, 2018 and 2017: For the Six Months Ended For the Six Months Ended June 30, 2018 June 30, 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Troubled debt restructurings: Agricultural loans 15 $ 5,375 3 $ 546 Total 15 $ 5,375 3 $ 546 The following table provides the troubled debt restructurings for the six months ended June 30, 2018 and 2017 grouped by type of concession: For the Six Months Ended For the Six Months Ended June 30, 2018 June 30, 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Agricultural loans Payment concessions 9 $ 3,744 2 $ 221 Extension of interest-only payments 6 1,631 — — Combination of extension of term and interest rate concessions — — 1 325 Total 15 $ 5,375 3 $ 546 Credit Quality Indicators The Company categorizes loans into risk categories based on relevant information about the ability of the borrowers to service their debt, such as current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. The Company analyzes agricultural, commercial, and commercial real estate loans individually by classifying the credits as to credit risk. The process of analyzing loans for changes in risk rating is ongoing through routine monitoring of the portfolio and annual internal credit reviews for credits with total exposure in excess of $300,000. The Company uses the following definitions for credit risk ratings: Sound. Credits classified as sound show very good probability of ongoing ability to meet and/or exceed obligations. Acceptable. Credits classified as acceptable show a good probability of ongoing ability to meet and/or exceed obligations. Satisfactory. Credits classified as satisfactory show fair probability of ongoing ability to meet and/or exceed obligations. Low Satisfactory . Credits classified as low satisfactory show fair probability of ongoing ability to meet and/or exceed obligations. Low satisfactory credits may be newer or have a less established track record of financial performance, inconsistent earnings, or may be going through an expansion. Watch. Credits classified as watch show some questionable probability of ongoing ability to meet and/or exceed obligations. Special Mention. Credits classified as special mention show potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loans or of the institution’s credit position at some future date. Substandard – Performing. Credits classified as substandard – performing generally have well-defined weaknesses. Collateral coverage is adequate and the loans are not considered impaired. Payments are being made and the loans are on accrual status. Substandard - Impaired . Credits classified as substandard generally have well-defined weaknesses that jeopardize the repayment of the debt. They have a distinct possibility that a loss will be sustained if the deficiencies are not corrected. Loans are considered impaired. Loans are either exhibiting signs of delinquency, are on non-accrual or are identified as a TDR. Doubtful. Credits classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable. The Company categorizes residential real estate, installment and consumer other loans as satisfactory at the time of origination based on information obtained as to the ability of the borrower(s) to service their debt, such as current financial information, employment status and history, historical payment experience, credit scores and type and amount of collateral among other factors. The Company updates relevant information on these types of loans at the time of refinance, troubled debt restructuring or other indications of financial difficulty, downgrading as needed using the same category descriptions as for agricultural, commercial, and commercial real estate loans. In addition, the Company further considers current payment status as an indicator of which risk category to assign the borrower. The greater the level of deteriorated risk as indicated by a loan’s assigned risk category, the greater the likelihood a loss will occur in the future. If the loan is substandard - impaired, then the loan loss reserves for the loan are recorded at the loss level of impairment. If the loan is not impaired, then its loan loss reserves are determined by the application of a loss rate that increases with risk in accordance with the allowance for loan loss analysis. Based on the most recent analysis performed by management, the risk category of loans by class of loans was as follows as of June 30, 2018 and December 31, 2017: As of June 30, 2018 Sound/ Acceptable/ Satisfactory/ Low Satisfactory Watch Special Mention Substandard Performing Substandard Impaired Total Loans (dollars in thousands) Agricultural loans $ 492,010 $ 130,625 $ 4,193 $ 32,760 $ 42,838 $ 702,426 Commercial real estate loans 239,625 35,196 590 11,407 2,366 289,184 Commercial loans 97,225 16,738 — 2,584 1,878 118,425 Residential real estate loans 67,310 3,840 — — — 71,150 Installment and consumer other 339 — — — — 339 Total $ 896,509 $ 186,399 $ 4,783 $ 46,751 $ 47,082 $ 1,181,524 As of December 31, 2017 Sound/ Acceptable/ Satisfactory/ Low Satisfactory Watch Special Mention Substandard Performing Substandard Impaired Total Loans (dollars in thousands) Agricultural loans $ 503,292 $ 115,374 $ 3,443 $ 35,577 $ 28,744 $ 686,430 Commercial real estate loans 225,898 50,043 4,574 9,724 2,465 292,704 Commercial loans 93,347 13,384 885 4,923 1,793 114,332 Residential real estate loans 50,917 4,221 — — — 55,138 Installment and consumer other 347 — — — — 347 Total $ 873,801 $ 183,022 $ 8,902 $ 50,224 $ 33,002 $ 1,148,951 As of June 30, 2018, the Company pledged $249.0 million of loans to secure a line-of-credit at the Federal Reserve of Chicago up to $186.7 million which was unused at June 30, 2018. No loans were pledged to the Federal Reserve of Chicago at December 31, 2017.

LOAN SERVICING RIGHTS

LOAN SERVICING RIGHTS	6 Months Ended
	Jun. 30, 2018
Transfers And Servicing [Abstract]
LOAN SERVICING RIGHTS	NOTE 5 – LOAN SERVICING RIGHTS Loans serviced for others are not included in the accompanying consolidated balance sheets. The risks inherent in servicing assets relate primarily to changes in prepayments that result from shifts in interest rates. The unpaid principal balances of mortgage and other loans serviced for others were approximately $628.4 million and $600.7 million at June 30, 2018 and December 31, 2017, respectively. The fair value of these rights were approximately $12.9 million and $12.5 million at June 30, 2018 and December 31, 2017. The fair value of servicing rights was determined using an assumed discount rate of 10 percent and prepayment speeds primarily ranging from 4 percent to 9 percent, depending upon the stratification of the specific right, and nominal credit losses. The following summarizes servicing rights capitalized and amortized, along with the aggregate activity in related valuation allowances: June 30, December 31, 2018 2017 (dollars in thousands) Loan servicing rights: Balance, beginning of period $ 8,950 $ 9,264 Additions 1,713 2,431 Disposals (486 ) (564 ) Amortization (1,090 ) (2,181 ) Balance, end of period $ 9,087 $ 8,950

GOODWILL AND CORE DEPOSIT INTAN

GOODWILL AND CORE DEPOSIT INTANGIBLE	6 Months Ended
	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
GOODWILL AND CORE DEPOSIT INTANGIBLE	NOTE 6 – GOODWILL AND CORE DEPOSIT INTANGIBLE The excess of the purchase price in an acquisition over the fair value of net assets acquired consists primarily of goodwill and the core deposit intangible. Goodwill is not amortized but is instead subject to impairment tests on at least an annual basis. Core deposit intangible, which arose from value ascribed to the deposit base of a bank acquired, has an estimated finite life and is amortized on an accelerated basis to expense over a 66-month period. Management will periodically review the carrying value of its long-lived and intangible assets to determine if any impairment has occurred, in which case an impairment charge would be recorded as an expense in the period of impairment, or whether changes in circumstances have occurred that would require a revision to the remaining useful life which would impact expense prospectively. In making such determination, management evaluates whether there are any adverse qualitative factors indicating that an impairment may exist, as well as the performance, on an undiscounted basis, of the underlying operations or assets which give rise to the intangible. Goodwill : Goodwill resulted from the acquisition of Fox River Valley Bancorp, Inc. (“Fox River Valley”) on May 13, 2016. The carrying amount of goodwill was $5.0 million at June 30, 2018 and December 31, 2017. Core deposit intangible: Core deposit intangible, primarily related to acquired customer relationships, is amortized over their estimated finite lives. The core deposit intangible related to the Fox River Valley acquisition had a gross carrying amount of $1.8 million. Amortization on core deposit intangible was $1.1 million at June 30, 2018 and $0.9 million at December 31, 2017. June 30, 2018 December 31, 2017 (dollars in thousands) Core deposit intangible: Gross carrying amount $ 1,801 $ 1,801 Accumulated amortization (1,100 ) (882 ) Net book value $ 701 $ 919 Additions during the period $ — $ —

DEPOSITS

DEPOSITS	6 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
DEPOSITS	NOTE 7 – DEPOSITS Deposits are summarized as follows at June 30, 2018 and December 31, 2017: June 30, December 31, 2018 2017 (dollars in thousands) Demand deposits $ 95,459 $ 125,584 Savings 280,870 277,993 Certificates of deposit 834,102 706,500 Total deposits $ 1,210,431 $ 1,110,077 At June 30, 2018 and, December 31, 2017 brokered deposits amounted to $323.6 million and $282.6 million, respectively, and are included in savings and certificates of deposit categories.

ADVANCES FROM FHLB AND OTHER BO

ADVANCES FROM FHLB AND OTHER BORROWINGS	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
ADVANCES FROM FHLB AND OTHER BORROWINGS	NOTE 8—ADVANCES FROM FHLB AND OTHER BORROWINGS The Bank had advances outstanding from the FHLB in the amount of $108.2 million and $121.5 million on June 30, 2018 and December 31, 2017, respectively. These advances, rates, and maturities were as follows: June 30, December 31, Maturity Rate 2018 2017 (dollars in thousands) Fixed rate, fixed term 01/02/2018 1.23 % $ — $ 1,000 Fixed rate, fixed term 01/12/2018 0.85 % — 8,000 Fixed rate, fixed term 02/12/2018 0.91 % — 5,000 Fixed rate, fixed term 04/23/2018 1.07 % — 2,300 Fixed rate, fixed term 06/18/2018 0.93 % — 10,000 Fixed rate, fixed term 07/16/2018 1.21 % 762 762 Fixed rate, fixed term 07/16/2018 1.21 % 1,038 1,038 Fixed rate, fixed term 07/19/2018 1.41 % 15,000 15,000 Fixed rate, fixed term 08/20/2018 1.15 % 1,000 1,000 Fixed rate, fixed term 08/20/2018 1.15 % 800 800 Fixed rate, fixed term 08/20/2018 1.27 % 2,200 2,200 Fixed rate, fixed term 11/09/2018 1.47 % 10,000 10,000 Fixed rate, fixed term 12/31/2018 1.65 % 3,000 3,000 Fixed rate, fixed term 02/27/2019 1.47 % 5,000 5,000 Fixed rate, fixed term 03/08/2019 1.54 % 10,000 10,000 Fixed rate, fixed term 07/15/2019 1.11 % 8,000 8,000 Fixed rate, fixed term 08/12/2019 2.24 % 5,000 — Fixed rate, fixed term 08/14/2019 1.77 % 2,000 2,000 Fixed rate, fixed term 02/20/2020 1.71 % 5,000 5,000 Fixed rate, fixed term 07/16/2020 1.85 % 800 800 Fixed rate, fixed term 08/25/2020 1.84 % 3,000 3,000 Fixed rate, fixed term 08/27/2020 1.88 % 5,000 5,000 Fixed rate, fixed term 12/30/2020 2.09 % 4,000 4,000 Fixed rate, fixed term 12/31/2020 1.94 % 600 600 Fixed rate, fixed term 04/12/2021 1.92 % 8,000 8,000 Fixed rate, fixed term 06/15/2021 1.39 % 5,000 5,000 Fixed rate, fixed term 08/16/2021 2.29 % 3,000 3,000 Fixed rate, fixed term 12/30/2021 2.29 % 2,000 2,000 Fixed rate, putable, no call 2 years 01/12/2023 2.03 % 8,000 — $ 108,200 $ 121,500 The terms of security agreements with the FHLB require the Bank to pledge collateral for its borrowings. The collateral consists of qualifying first mortgage loans and stock of the FHLB. The Bank had no irrevocable letters of credit with the FHLB as of June 30, 2018 and December 31, 2017. Future maturities of FHLB borrowings as of June 30, 2018 and December 31, 2017 were as follows: June 30, December 31, 2018 2017 (dollars in thousands) 1 year or less $ 48,800 $ 60,100 1 to 2 years 20,000 25,000 2 to 3 years 26,400 18,400 3 to 4 years 5,000 18,000 Over 4 years 8,000 — $ 108,200 $ 121,500 As of June 30, 2018 and December 31, 2017, the Bank also had a line of credit available with the Federal Reserve Bank of Chicago. Borrowings under this line of credit are limited by the amount of collateral pledged by the Bank, which totaled $186.7 million in loans and $8.6 million in securities at June 30, 2018 and December 31, 2017, respectively. There were no outstanding advances included in other borrowings at June 30, 2018 and December 31, 2017. On September 14, 2017, the Company entered into a credit agreement with U.S. Bank, National Association for a $15.0 million revolving line of credit with an interest rate of the one-month LIBOR rate plus 2.25%. The line also bears a non-usage fee of 0.275% per annum. The line did not have an outstanding balance as of June 30, 2018 and December 31, 2017. Other borrowings are borrowings as a result of sold loans that do not qualify for sale accounting. These agreements are recorded as financing transactions as the Bank maintains effective control over the transferred loans. The dollar amount of the loans underlying the sale agreements continues to be carried in the Bank’s loan portfolio, and the transfer is reported as a secured borrowing with pledge of collateral. At June 30, 2018 and December 31, 2017, the amounts of these borrowings were $0.8 million and $1.3 million, respectively. Also included in other borrowings is the capital lease for our full service banking location in Appleton, Wisconsin that was assumed in connection with our merger of Fox River Valley. Under the terms of the current triple-net lease the Company is obligated to pay monthly rent of $15 thousand, and the original term of the lease expired in April 2018. As of June 30, 2018, liability remaining under the capital lease was $0, and the amortization related to the lease was $41 thousand and was included in other non-interest income. As of December 31, 2017, liability remaining under the capital lease was $41 thousand, and the amortization related to the lease was $148 thousand and as included in other non-interest expense. During the fourth quarter of 2017, the term of the lease was extended to April 2019, and the Company is obligated to pay monthly rent of $16 thousand. The renegotiation of terms results in the extended term being classified as an operating lease, and the future rent expense will be included in occupancy expense. The following table sets forth information concerning balances and interest rates on other borrowings as of and for the periods indicated: June 30, December 31, 2018 2017 (dollars in thousands) Balance outstanding at end of period $ 841 $ 1,299 Average amount outstanding during the period 1,226 1,545 Maximum amount outstanding at any month end 1,278 1,825 Weighted average interest rate during the period 4.94 % 5.77 % Weighted average interest rate at end of period 4.51 % 6.41 %

SUBORDINATED DEBENTURES

SUBORDINATED DEBENTURES	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
SUBORDINATED DEBENTURES	NOTE 9—SUBORDINATED DEBENTURES On May 30, 2018, the Company entered into a Subordinated Note Purchase Agreement with certain institutional investors pursuant to which the Company sold and issued $30.0 million in aggregate principal amount of its 5.875% fixed-to-floating rate subordinated notes due 2028. The Notes were issued by the Company to the purchasers at a price equal to 100% of their face amount. The Notes have a stated maturity of June 1, 2028, are redeemable, in whole or in part, on or after June 1, 2023, and at any time upon the occurrences of certain events. The Notes will bear interest at a fixed rate of 5.875% per year, from and including May 30, 2018 to, but excluding, June 1, 2023. From and including June 1, 2023 to, but excluding the maturity date or early redemption date, the interest rate will reset quarterly at a variable rate equal to the then current 3-month LIBOR plus 288.4 basis points. The notes qualify as Tier II capital of the Company.

EQUITY INCENTIVE PLAN

EQUITY INCENTIVE PLAN	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
EQUITY INCENTIVE PLAN	NOTE 10 – EQUITY INCENTIVE PLAN Under the Company’s 2016 Long Term Incentive Plan (the “Plan”), the Company may grant options to purchase shares of common stock and issue restricted stock to its directors, officers, and employees. Both qualified and non-qualified stock options and restricted stock may be granted and issued, respectively, under the Plan. As of June 30, 2018, 84,747 options or shares of restricted stock have been granted under the Plan. The exercise price of each option equals the market price of the Company’s stock on the date of grant and an option’s maximum term is ten years. Vesting periods range from one to five years from the date of grant. The restricted stock vesting periods range from one to five years from the date of issuance. The status of the Plan as of June 30, 2018 and changes in the Plan during the six months ended June 30, 2018 were as follows: June 30, 2018 Number of Options Weighted-Average Exercise Price Aggregate Intrinsic Value (1) (dollars in thousands except option and per share data) Outstanding, beginning of year 228,318 $ 17.24 Granted 13,832 26.83 Exercised (12,592 ) 16.42 Forfeited/expired (8,484 ) 19.95 Outstanding, end of period 221,074 $ 17.78 $ 2,149 Options exercisable at period-end 169,507 $ 16.33 $ 1,893 Weighted-average fair value of options granted during the period (2) $ 10.13 (1) The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on June 30, 2018. This amount changes based on changes in the market value of the Company’s stock. (2) The fair value (present value of the estimated future benefit to the option holder) of each option grant is estimated on the date of grant using the Black-Scholes option pricing model. Activity in restricted stock awards and restricted stock units for the six months ended June 30, 2018 was as follows: June 30, 2018 Restricted Stock Awards Weighted Average Grant Price Outstanding, beginning of year 41,217 $ 18.35 Granted 6,611 27.15 Vested (14,615 ) 15.40 Forfeited/expired (2,521 ) 25.89 Outstanding, end of period 30,692 $ 21.04 June 30, 2018 Restricted Stock Units Weighted Average Grant Price Outstanding, beginning of year 8,691 $ 25.53 Granted 9,840 27.46 Issued (3,384 ) 23.66 Forfeited/expired — — Outstanding, end of period 15,147 $ 27.20 For the six months ended June 30, 2018 and 2017, share-based compensation expense, including options and restricted stock awards, applicable to the Plan was $259 thousand and $239 thousand, respectively. As of June 30, 2018, unrecognized share-based compensation expense related to nonvested options and restricted stock awards amounted to $0.8 million and is expected to be recognized over a weighted average period of 1.9 years.

REGULATORY MATTERS

REGULATORY MATTERS	6 Months Ended
	Jun. 30, 2018
Regulatory Capital Requirements [Abstract]
REGULATORY MATTERS	NOTE 11 – REGULATORY MATTERS The Company (on a consolidated basis) and the Bank are each subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the following table) of total, Tier 1 and Tier 1 Common Equity capital to risk-weighted assets, and of Tier 1 capital to average assets, as such terms are defined in the regulations. Management believed, as of June 30, 2018 and December 31, 2017, that the Company and the Bank met all capital adequacy requirements to which they were subject. As of June 30, 2018, the Bank’s capital ratios met those required to be considered as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 Common Equity risk-based, and Tier 1 leverage ratios as set forth in the following tables. The Company’s and the Bank’s actual capital amounts and ratios are presented in the following table: Actual Minimum For Capital Adequacy Purposes (a) Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) June 30, 2018 Total Capital (to risk weighted assets): Consolidated $ 203,514 15.57 % $ 129,089 9.875 % No t Bank 196,357 15.03 % 129,026 9.875 % $ 130,659 10.00 % Tier 1 Capital (to risk weighted assets): Consolidated 158,695 12.14 % 102,944 7.875 % Not applicable Bank 180,706 13.83 % 102,894 7.875 % 104,527 8.00 % Tier 1 Capital (to average assets): Consolidated 158,695 10.66 % 59,549 4.00 % Not applicable Bank 180,706 12.15 % 59,511 4.00 % 74,388 5.00 % Tier 1 Common Equity Ratio (to risk weighted assets): Consolidated 135,138 10.34 % 83,336 6.375 % Not applicable Bank 180,706 13.83 % 83,295 6.375 % 84,928 6.50 % December 31, 2017 Total Capital (to risk weighted assets): Consolidated $ 165,174 13.08 % $ 116,775 9.25 % Not applicable Bank 161,375 12.79 % 116,719 9.25 % $ 126,183 10.00 % Tier 1 Capital (to risk weighted assets): Consolidated 151,363 11.99 % 91,526 7.25 % Not applicable Bank 147,564 11.69 % 91,483 7.25 % 100,946 8.00 % Tier 1 Capital (to average assets): Consolidated 151,363 11.03 % 54,914 4.00 % Not applicable Bank 147,564 10.76 % 54,875 4.00 % 68,594 5.00 % Tier 1 Common Equity Ratio (to risk weighted assets): Consolidated 127,840 10.13 % 72,590 5.75 % Not applicable Bank 147,564 11.69 % 72,555 5.75 % 82,019 6.50 % (a) The ratios for June 30, 2018 and December 31, 2017 include a capital conservation buffer of 1.875% and 1.25%, respectively. The rules of the Basel III regulatory capital framework implemented a capital conservation buffer that is added to the minimum requirements for capital adequacy purposes. The capital conservation buffer is subject to a three year phase-in period that began on January 1, 2016 and will be fully phased in on January 1, 2019 at 2.5%. The required phase-in capital conservation buffer during 2018 is 1.875%. At the present time, the ratios for the Company and the Bank are sufficient to meet the fully phased-in conservation buffer.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	NOTE 12 – FAIR VALUE MEASUREMENTS ASC 820-10 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are independent, knowledgeable, and both able and willing to transact. ASC 820-10 requires the use of valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable or unobservable. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC 820-10 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1—Valuation is based on quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 assets and liabilities generally include debt and equity securities that are traded in an active exchange market. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2—Valuation is based on inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. The valuation may be based on quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. Level 3—Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which determination of fair value requires significant management judgment or estimation. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The following methods and assumptions were used by the Company in estimating the fair value disclosures for financial instruments recorded at fair value on a recurring basis: Securities Available for Sale Where quoted prices are available in an active market, the Company classifies the securities within Level 1 of the valuation hierarchy. Securities are defined as both long and short positions. Level 1 securities include highly liquid government bonds and exchange-traded equities. If quoted market prices are not available, the Company estimates fair values using pricing models and discounted cash flows that consider standard input factors such as observable market data, benchmark yields, interest rate volatilities, broker/dealer quotes and credit spreads. Examples of such instruments, which would generally be classified within Level 2 of the valuation hierarchy, include U.S. government and agency securities, corporate bonds and other securities. Mortgage-backed securities are included in Level 2 if observable inputs are available. In certain cases where there is limited activity or less transparency around inputs to the valuation, the Company classifies those securities in Level 3. Derivative Instruments The Company's derivative instruments consist of interest rate swaps, which are accounted for as cash flow hedges. The Company's derivative positions are classified within Level 2 of the fair value hierarchy and are valued using models generally accepted in the financial services industry and that use actively quoted or observable market input values from external market data providers and/or non-binding broker-dealer quotations. The fair value of the derivatives is determined using discounted cash flow models. These models’ key assumptions include the contractual terms of the respective contract along with significant observable inputs, including interest rates, yield curves, nonperformance risk and volatility. Assets measured at fair value on a recurring basis are summarized below: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (dollars in thousands) June 30, 2018 Securities available for sale: U.S. government and agency securities $ — $ 4,553 $ — $ 4,553 U.S. treasury Securities — 2,493 — 2,493 Municipal securities — 37,372 — 37,372 Mortgage-backed securities — 143,087 — 143,087 Derivative instruments, interest rate swaps — 51 — 51 Total assets at fair value $ — $ 187,556 $ — $ 187,556 December 31, 2017 Securities available for sale: U.S. government and agency securities $ — $ — $ — $ — Municipal securities — 26,634 — 26,634 Mortgage-backed securities — 70,744 — 70,744 Total assets at fair value $ — $ 97,378 $ — $ 97,378 Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, they are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents the financial instruments carried on the consolidated balance sheet by caption and by level in the fair value hierarchy for which a nonrecurring change in fair value has been recorded: Level 1 Inputs Level 2 Inputs Level 3 Inputs Impairment Losses (dollars in thousands) June 30, 2018 Impaired loans $ — $ — $ 47,082 $ 3,646 Other real estate owned — — 9,004 104 Total assets at fair value $ — $ — $ 56,086 $ 3,750 December 31, 2017 Impaired loans $ — $ — $ 33,002 $ 1,436 Other real estate owned — — 4,962 905 Total assets at fair value $ — $ — $ 37,964 $ 2,341 The significant inputs used in the fair value measurements for Level 3 assets measured at fair value on a nonrecurring basis are as follows: June 30, 2018 Valuation Techniques Unobservable Inputs Range (Average) Impaired loans Evaluation of collateral Estimation of value NM* Other real estate owned Appraisal Appraisal adjustment 3%-39% (20%) December 31, 2017 Valuation Techniques Unobservable Inputs Range (Average) Impaired loans Evaluation of collateral Estimation of value NM* Other real estate owned Appraisal Appraisal adjustment 0%-39% (14%) * Not Meaningful. The estimated fair values, and related carrying or notional amounts, of the Company’s financial instruments were as follows: June 30, December 31, 2018 2017 Carrying Amount Fair Value Carrying Amount Fair Value Input Level (dollars in thousands) Financial assets: Cash and cash equivalents $ 81,044 $ 81,044 $ 66,771 $ 66,771 1 Securities available for sale 187,505 187,505 126,030 126,030 2 FHLB Stock 3,354 3,354 4,138 4,138 2 Loans, net of allowance for loan losses 1,166,395 1,160,060 1,135,704 1,135,861 3 Loans held for sale 11,468 11,468 6,575 6,575 3 Accrued interest receivable 4,874 4,874 3,793 3,793 2 Loan servicing rights 9,087 12,872 8,950 12,194 3 Derivative instruments, interest rate swaps 51 51 — — 2 Financial liabilities: Deposits: Time 834,102 826,471 706,500 709,219 3 Other deposits 376,329 362,117 403,577 401,503 1 Other borrowings 841 841 1,299 1,299 3 Advances from FHLB 108,200 107,007 121,500 121,793 3 Subordinated debentures 44,725 44,725 15,523 15,523 3 Accrued interest payable 2,699 2,699 2,389 2,389 2

OTHER REAL ESTATE OWNED

OTHER REAL ESTATE OWNED	6 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
OTHER REAL ESTATE OWNED	NOTE 13 – OTHER REAL ESTATE OWNED Changes in other real estate owned were as follows: For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Balance, beginning of period $ 9,379 $ 6,995 $ 4,962 $ 3,161 Assets foreclosed 1,687 — 6,104 4,512 Write-down of other real estate owned (104 ) (78 ) (104 ) (78 ) Net gain on sales of other real estate owned 149 27 149 402 Proceeds from sale of other real estate owned (2,107 ) (27 ) (2,107 ) (1,080 ) Balance, end of period $ 9,004 $ 6,917 $ 9,004 $ 6,917 Expenses (income) applicable to other real estate owned included in non-interest expense include the following: For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Net gain on sales of other real estate owned $ (149 ) $ (27 ) $ (149 ) $ (402 ) Write-down of other real estate owned 104 78 104 78 Operating expenses, net of rental income 108 25 216 69 $ 63 $ 76 $ 171 $ (255 )

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 14 – DERIVATIVE FINANCIAL INSTRUMENTS On June 15, 2018, the Company executed an interest rate swap to manage interest rate risk on two sets of its trust preferred securities. This derivative contract involves the receipt of floating rate interest from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. This instrument is designated as a cash flow hedge as the receipt of floating rate interest from the counterparty is used to manage interest rate risk associated with three month LIBOR advances. The change in the fair value of this hedging instrument is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings. As of June 30, 2018, the Company had two outstanding interest rate swaps designated as a cash flow hedge each with an aggregate notional value of $6.0 million. Both interest rate swaps mature on June 15, 2028. A pre-tax unrealized loss of $98 thousand was recognized in accumulated other comprehensive income for the six months ended June 30, 2018, and there was no ineffective portion of this hedge. There were no interest rate swaps designated as a cash flow hedge outstanding at December 31, 2017. The Company is exposed to credit risk in the event of nonperformance by the interest rate swaps counterparty. The Company minimizes this risk by entering into derivative contracts with only large, stable financial institutions, and the Company has not experienced, and does not expect, any losses from counterparty nonperformance on the interest rate swaps. The Company monitors counterparty risk in accordance with the provisions of FASB ASC 815. In addition, the interest rate swap agreements contains language outlining collateral-pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits. Derivative contracts are executed with a Credit Support Annex, which is a bilateral ratings-sensitive agreement that requires collateral postings at established credit threshold levels. These agreements protect the interests of the Company and its counterparties should either party suffer a credit rating deterioration. The Company was required to pledge $150 thousand of cash as collateral to the counterparty as of June 30, 2018.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 15 – SUBSEQUENT EVENTS Management evaluated subsequent events through the date the financial statements were issued. On August 1, 2018, ABS 1, LLC purchased a plot of land in Appleton, Wisconsin for $1.3 million. Company intends to construct a new branch on the land, and relocate the existing Appleton location, which is currently being leased, late in 2019. There were no other significant events or transactions occurring after June 30, 2018, but prior to August 8, 2018, that provided additional evidence about conditions that existed at June 30, 2018.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Derivative Instruments	Significant Accounting Policies Derivative Instruments. Derivative instruments, classified on the balance sheet as an other asset, represent contracts between parties that usually require little or no initial net investment and result in one party delivering cash to the other party based on a notional amount and an underlying variable, as specified in the contract, and may be subject to master netting agreements. During the second quarter of 2018, the Company executed an interest rate swap to manage interest rate risk on two sets of its trust preferred securities. This derivative contract involves the receipt of floating rate interest from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreement, without the exchange of the underlying notional value. This instrument is designated as a cash flow hedge as the receipt of floating rate interest from the counterparty is used to manage interest rate risk associated with three month LIBOR advances. The change in the fair value of this hedging instrument is recorded in accumulated other comprehensive income, net of taxes, and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings while the ineffective portion of changes in the fair value of the derivative, if any, is recognized immediately in other noninterest income. The Company assesses the effectiveness of the hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instrument with the cumulative changes in cash flows of the designated hedged item or transaction.
New Accounting Pronouncements	New Accounting Pronouncements In April 2016, the Financial Accounting Standards Board (the “FASB”) issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses In March 2017, the FASB issued updated guidance codified within ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs In May 2017, the FASB issued updated guidance codified within ASU No. 2017-09, Compensation – Stock Compensation . In July 2017, the FASB issued ASU No. 2017-11, Earnings Per Share – Accounting for Certain Financial Instruments with Down Round Features In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815) In September 2017, the FASB issued updated guidance codified within ASU No. 2017-13, Revenue Recognition, Revenue from Contracts with Customers, Leases (Topic 840), and Leases (Topic 842) Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers Revenue from Contracts with Customers In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In June 2018, the FASB issued ASU 2018-07, Stock Compensation – Improvements to Nonemployee Share-Based Payment Accounting

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding during the applicable period. Diluted earnings per share is computed using the weighted-average number of shares determined for the basic earnings per common share plus the dilutive effect of share-based compensation using the treasury stock method. For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Net income from continuing operations $ 3,850 $ 2,058 $ 7,904 $ 4,690 Less: preferred stock dividends 99 85 196 166 Income available to common shareholders for basic earnings per common share $ 3,751 $ 1,973 $ 7,708 $ 4,524 Average number of common shares issued 7,351,985 7,328,282 7,349,923 7,323,885 Less: weighted average treasury shares 442,102 432,861 440,974 432,484 Less: weighted average nonvested equity incentive plan shares 219,315 266,186 224,550 278,810 Weighted average number of common shares outstanding 6,690,568 6,629,235 6,684,399 6,612,591 Effect of dilutive options 79,368 84,958 77,518 88,987 Weighted average number of common shares outstanding used to calculate diluted earnings per common share 6,769,936 6,714,193 6,761,917 6,701,578

SECURITIES AVAILABLE-FOR-SALE (

SECURITIES AVAILABLE-FOR-SALE (Tables)	6 Months Ended
	Jun. 30, 2018
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Available-for-Sale of Securities	The amortized cost and fair value of securities available-for-sale as of June 30, 2018 and December 31, 2017 were as follows: Amortized Unrealized Unrealized Fair Cost Gains Losses Value (dollars in thousands) June 30, 2018 U.S. government and agency securities $ 4,599 $ — $ (46 ) $ 4,553 U.S. treasury securities 2,496 — (3 ) 2,493 Municipal securities 38,090 10 (728 ) 37,372 Mortgage-backed securities 146,162 98 (3,173 ) 143,087 $ 191,347 $ 108 $ (3,950 ) $ 187,505 December 31, 2017 U.S. government and agency securities $ 4,874 $ 82 $ — $ 4,956 Municipal securities 33,949 56 (240 ) 33,765 Mortgage-backed securities 88,242 64 (997 ) 87,309 $ 127,065 $ 202 $ (1,237 ) $ 126,030
Schedule of Amortized Cost and Fair Value of Securities Available for Sale by Contractual Maturity	The amortized cost and fair value of securities at June 30, 2018 and December 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Cost Value (dollars in thousands) June 30, 2018 Due in one year or less $ 8,799 $ 8,784 Due from one to five years 9,759 9,637 Due from five to ten years 8,502 8,367 Due after ten years 18,125 17,630 Mortgage-backed securities 146,162 143,087 $ 191,347 $ 187,505 December 31, 2017 Due in one year or less $ 7,990 $ 7,980 Due from one to five years 10,494 10,470 Due from five to ten years 11,482 11,494 Due after ten years 8,857 8,777 Mortgage-backed securities 88,242 87,309 $ 127,065 $ 126,030
Schedule of Fair Value and Gross Unrealized Losses of Entity's Investment	The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temorarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2018 and December 31, 2017: Less Than 12 Months 12 Months or Greater Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses (dollars in thousands) June 30, 2018 U.S. government and agency securities $ 4,553 $ (46 ) $ — $ — $ 4,553 $ (46 ) U.S. treasury securities 2,493 (3 ) — — 2,493 (3 ) Municipal securities 32,976 (711 ) 899 (17 ) 33,875 (728 ) Mortgage-backed securities 102,839 (2,443 ) 14,631 (730 ) 117,470 (3,173 ) $ 142,861 $ (3,203 ) $ 15,530 $ (747 ) $ 158,391 $ (3,950 ) December 31, 2017 Municipal securities $ 25,280 $ (224 ) $ 1,354 $ (16 ) $ 26,634 $ (240 ) Mortgage-backed securities 54,278 (521 ) 16,466 (476 ) 70,744 (997 ) $ 79,558 $ (745 ) $ 17,820 $ (492 ) $ 97,378 $ (1,237 )

LOANS (Tables)

LOANS (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Components of Loans	The components of loans were as follows: June 30, December 31, 2018 2017 (dollars in thousands) Agricultural loans $ 702,426 $ 686,430 Commercial real estate loans 289,184 292,704 Commercial loans 118,425 114,332 Residential real estate loans 71,150 55,138 Installment and consumer other 339 347 Total gross loans 1,181,524 1,148,951 Allowance for loan losses (15,129 ) (13,247 ) Net loans $ 1,166,395 $ 1,135,704
Changes in Allowance for Loan Losses by Portfolio Segment	Changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018 and 2017 were as follows: Agricultural Commercial Real Estate Commercial Residential Real Estate Installment and Consumer Other Total (dollars in thousands) June 30, 2018 Balance, beginning of year $ 9,712 $ 1,978 $ 1,508 $ 47 $ 2 $ 13,247 Provision for loan losses 1,915 (1,284 ) 3 (3 ) (1 ) 630 Loans charged off — (42 ) — — — (42 ) Recoveries 1 1,251 41 — 1 1,294 Balance, end of period $ 11,628 $ 1,903 $ 1,552 $ 44 $ 2 $ 15,129 June 30, 2017 Balance, beginning of year $ 8,173 $ 2,762 $ 1,239 $ 470 $ 1 $ 12,645 Provision for loan losses 1,029 473 1,028 (246 ) 1 2,285 Loans charged off — (575 ) (917 ) — — (1,492 ) Recoveries 1 36 28 — — 65 Balance, end of period $ 9,203 $ 2,696 $ 1,378 $ 224 $ 2 $ 13,503
Balances in Allowance for Loan Losses and Recorded Balance in Loans by Portfolio Segment and Based on Impairment Method	The following tables present the balances in the allowance for loan losses and the recorded balance in loans by portfolio segment and based on impairment method as of June 30, 2018 and December 31, 2017: June 30, 2018 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (dollars in thousands) Allowance for loan losses: Agricultural loans $ 2,855 $ 8,773 $ 11,628 Commercial real estate loans 10 1,893 1,903 Commercial loans 781 771 1,552 Residential real estate loans — 44 44 Installment and consumer other — 2 2 Total ending allowance for loan losses 3,646 11,483 15,129 Loans: Agricultural loans 42,838 659,588 702,426 Commercial real estate loans 2,366 286,818 289,184 Commercial loans 1,878 116,547 118,425 Residential real estate loans — 71,150 71,150 Installment and consumer other — 339 339 Total loans 47,082 1,134,442 1,181,524 Net loans $ 43,436 $ 1,122,959 $ 1,166,395 December 31, 2017 Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (dollars in thousands) Allowance for loan losses: Agricultural loans $ 1,026 $ 8,686 $ 9,712 Commercial real estate loans — 1,978 1,978 Commercial loans 410 1,098 1,508 Residential real estate loans — 47 47 Installment and consumer other — 2 2 Total ending allowance for loan losses 1,436 11,811 13,247 Loans: Agricultural loans 28,744 657,686 686,430 Commercial real estate loans 2,465 290,239 292,704 Commercial loans 1,793 112,539 114,332 Residential real estate loans — 55,138 55,138 Installment and consumer other — 347 347 Total loans 33,002 1,115,949 1,148,951 Net loans $ 31,566 $ 1,104,138 $ 1,135,704
Schedule of Aging of Recorded Investment in Past Due Loans	The following table presents the aging of the recorded investment in past due loans at June 30, 2018 and December 31, 2017: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Past Due Loans Not Past Due Total Loans (dollars in thousands) June 30, 2018 Agricultural loans $ 1,132 $ 780 $ 5,709 $ 7,621 $ 694,805 $ 702,426 Commercial real estate loans 2,385 — 2,366 4,751 284,433 289,184 Commercial loans — 731 1,089 1,820 116,605 118,425 Residential real estate loans — — — — 71,150 71,150 Installment and consumer other — — — — 339 339 Total $ 3,517 $ 1,511 $ 9,164 $ 14,192 $ 1,167,332 $ 1,181,524 December 31, 2017 Agricultural loans $ 476 $ — $ 6,819 $ 7,295 $ 679,135 $ 686,430 Commercial real estate loans — — 2,149 2,149 290,555 292,704 Commercial loans 1,064 — 642 1,706 112,626 114,332 Residential real estate loans — — — — 55,138 55,138 Installment and consumer other — — — — 347 347 Total $ 1,540 $ — $ 9,610 $ 11,150 $ 1,137,801 $ 1,148,951
Nonaccrual, Restructured and Certain Past Due Loans	The following table lists information on nonaccrual, restructured, and certain past due loans at June 30, 2018 and December 31, 2017: June 30, December 31, 2018 2017 (dollars in thousands) Nonaccrual loans, 90 days or more past due $ 9,164 $ 9,610 Nonaccrual loans 30-89 days past due 1,778 1,493 Nonaccrual loans, less than 30 days past due 15,363 456 Restructured loans not on nonaccrual status 11,173 9,019 90 days or more past due and still accruing — — Total $ 37,478 $ 20,578
Average Recorded Investment and Interest Income Recognized on Impaired Loans by Portfolio Segment	The following table presents the average recorded investment and interest income recognized on impaired loans by portfolio segment for six months ended June 30, 2018 and 2017: For the Six Months Ended 2018 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (dollars in thousands) Agricultural loans $ 35,791 $ 1,417 $ 10,810 $ 113 Commercial real estate loans 2,416 6 4,392 60 Commercial loans 1,836 25 2,254 4 Residential real estate loans — — 34 — Total $ 40,042 $ 1,448 $ 17,490 $ 177
TDRs by Loan Class	The following table presents the TDRs by loan class at June 30, 2018 and December 31, 2017: Non-Accrual Restructured and Accruing Total (dollars in thousands) June 30, 2018 Agricultural loans $ 6,136 $ 11,150 $ 17,286 Commercial real estate loans 323 — 323 Commercial loans — 23 23 Total $ 6,459 $ 11,173 $ 17,632 December 31, 2017 Agricultural loans $ 3,822 $ 8,668 $ 12,490 Commercial real estate loans 575 316 891 Commercial loans — 35 35 Total $ 4,397 $ 9,019 $ 13,416 The following table provides the number of loans modified in a troubled debt restructuring investment by class for the six months ended June 30, 2018 and 2017: For the Six Months Ended For the Six Months Ended June 30, 2018 June 30, 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Troubled debt restructurings: Agricultural loans 15 $ 5,375 3 $ 546 Total 15 $ 5,375 3 $ 546
Summary of Troubled Debt Restructurings Grouped by Type of Concession	The following table provides the troubled debt restructurings for the six months ended June 30, 2018 and 2017 grouped by type of concession: For the Six Months Ended For the Six Months Ended June 30, 2018 June 30, 2017 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in thousands) Agricultural loans Payment concessions 9 $ 3,744 2 $ 221 Extension of interest-only payments 6 1,631 — — Combination of extension of term and interest rate concessions — — 1 325 Total 15 $ 5,375 3 $ 546
Risk Category of Loans by Class of Loans	Based on the most recent analysis performed by management, the risk category of loans by class of loans was as follows as of June 30, 2018 and December 31, 2017: As of June 30, 2018 Sound/ Acceptable/ Satisfactory/ Low Satisfactory Watch Special Mention Substandard Performing Substandard Impaired Total Loans (dollars in thousands) Agricultural loans $ 492,010 $ 130,625 $ 4,193 $ 32,760 $ 42,838 $ 702,426 Commercial real estate loans 239,625 35,196 590 11,407 2,366 289,184 Commercial loans 97,225 16,738 — 2,584 1,878 118,425 Residential real estate loans 67,310 3,840 — — — 71,150 Installment and consumer other 339 — — — — 339 Total $ 896,509 $ 186,399 $ 4,783 $ 46,751 $ 47,082 $ 1,181,524 As of December 31, 2017 Sound/ Acceptable/ Satisfactory/ Low Satisfactory Watch Special Mention Substandard Performing Substandard Impaired Total Loans (dollars in thousands) Agricultural loans $ 503,292 $ 115,374 $ 3,443 $ 35,577 $ 28,744 $ 686,430 Commercial real estate loans 225,898 50,043 4,574 9,724 2,465 292,704 Commercial loans 93,347 13,384 885 4,923 1,793 114,332 Residential real estate loans 50,917 4,221 — — — 55,138 Installment and consumer other 347 — — — — 347 Total $ 873,801 $ 183,022 $ 8,902 $ 50,224 $ 33,002 $ 1,148,951

LOAN SERVICING RIGHTS (Tables)

LOAN SERVICING RIGHTS (Tables)	6 Months Ended
	Jun. 30, 2018
Transfers And Servicing [Abstract]
Summary of Servicing Rights Capitalized and Amortized along with the Aggregate Activity in Related Valuation	The following summarizes servicing rights capitalized and amortized, along with the aggregate activity in related valuation allowances: June 30, December 31, 2018 2017 (dollars in thousands) Loan servicing rights: Balance, beginning of period $ 8,950 $ 9,264 Additions 1,713 2,431 Disposals (486 ) (564 ) Amortization (1,090 ) (2,181 ) Balance, end of period $ 9,087 $ 8,950

GOODWILL AND CORE DEPOSIT INT29

GOODWILL AND CORE DEPOSIT INTANGIBLE (Tables)	6 Months Ended
	Jun. 30, 2018
Core Deposit
Finite Lived Intangible Assets [Line Items]
Core Deposit Intangible	June 30, 2018 December 31, 2017 (dollars in thousands) Core deposit intangible: Gross carrying amount $ 1,801 $ 1,801 Accumulated amortization (1,100 ) (882 ) Net book value $ 701 $ 919 Additions during the period $ — $ —

DEPOSITS (Tables)

DEPOSITS (Tables)	6 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
Summary of Deposits	Deposits are summarized as follows at June 30, 2018 and December 31, 2017: June 30, December 31, 2018 2017 (dollars in thousands) Demand deposits $ 95,459 $ 125,584 Savings 280,870 277,993 Certificates of deposit 834,102 706,500 Total deposits $ 1,210,431 $ 1,110,077

ADVANCES FROM FHLB AND OTHER 31

ADVANCES FROM FHLB AND OTHER BORROWINGS (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Advances Outstanding from FHLB	The Bank had advances outstanding from the FHLB in the amount of $108.2 million and $121.5 million on June 30, 2018 and December 31, 2017, respectively. These advances, rates, and maturities were as follows: June 30, December 31, Maturity Rate 2018 2017 (dollars in thousands) Fixed rate, fixed term 01/02/2018 1.23 % $ — $ 1,000 Fixed rate, fixed term 01/12/2018 0.85 % — 8,000 Fixed rate, fixed term 02/12/2018 0.91 % — 5,000 Fixed rate, fixed term 04/23/2018 1.07 % — 2,300 Fixed rate, fixed term 06/18/2018 0.93 % — 10,000 Fixed rate, fixed term 07/16/2018 1.21 % 762 762 Fixed rate, fixed term 07/16/2018 1.21 % 1,038 1,038 Fixed rate, fixed term 07/19/2018 1.41 % 15,000 15,000 Fixed rate, fixed term 08/20/2018 1.15 % 1,000 1,000 Fixed rate, fixed term 08/20/2018 1.15 % 800 800 Fixed rate, fixed term 08/20/2018 1.27 % 2,200 2,200 Fixed rate, fixed term 11/09/2018 1.47 % 10,000 10,000 Fixed rate, fixed term 12/31/2018 1.65 % 3,000 3,000 Fixed rate, fixed term 02/27/2019 1.47 % 5,000 5,000 Fixed rate, fixed term 03/08/2019 1.54 % 10,000 10,000 Fixed rate, fixed term 07/15/2019 1.11 % 8,000 8,000 Fixed rate, fixed term 08/12/2019 2.24 % 5,000 — Fixed rate, fixed term 08/14/2019 1.77 % 2,000 2,000 Fixed rate, fixed term 02/20/2020 1.71 % 5,000 5,000 Fixed rate, fixed term 07/16/2020 1.85 % 800 800 Fixed rate, fixed term 08/25/2020 1.84 % 3,000 3,000 Fixed rate, fixed term 08/27/2020 1.88 % 5,000 5,000 Fixed rate, fixed term 12/30/2020 2.09 % 4,000 4,000 Fixed rate, fixed term 12/31/2020 1.94 % 600 600 Fixed rate, fixed term 04/12/2021 1.92 % 8,000 8,000 Fixed rate, fixed term 06/15/2021 1.39 % 5,000 5,000 Fixed rate, fixed term 08/16/2021 2.29 % 3,000 3,000 Fixed rate, fixed term 12/30/2021 2.29 % 2,000 2,000 Fixed rate, putable, no call 2 years 01/12/2023 2.03 % 8,000 — $ 108,200 $ 121,500
Future Maturities of FHLB Borrowings	Future maturities of FHLB borrowings as of June 30, 2018 and December 31, 2017 were as follows: June 30, December 31, 2018 2017 (dollars in thousands) 1 year or less $ 48,800 $ 60,100 1 to 2 years 20,000 25,000 2 to 3 years 26,400 18,400 3 to 4 years 5,000 18,000 Over 4 years 8,000 — $ 108,200 $ 121,500
Balances and Interest Rates on Other Borrowings	The following table sets forth information concerning balances and interest rates on other borrowings as of and for the periods indicated: June 30, December 31, 2018 2017 (dollars in thousands) Balance outstanding at end of period $ 841 $ 1,299 Average amount outstanding during the period 1,226 1,545 Maximum amount outstanding at any month end 1,278 1,825 Weighted average interest rate during the period 4.94 % 5.77 % Weighted average interest rate at end of period 4.51 % 6.41 %

EQUITY INCENTIVE PLAN (Tables)

EQUITY INCENTIVE PLAN (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Status and Changes in Stock Option 2016 Plan	The status of the Plan as of June 30, 2018 and changes in the Plan during the six months ended June 30, 2018 were as follows: June 30, 2018 Number of Options Weighted-Average Exercise Price Aggregate Intrinsic Value (1) (dollars in thousands except option and per share data) Outstanding, beginning of year 228,318 $ 17.24 Granted 13,832 26.83 Exercised (12,592 ) 16.42 Forfeited/expired (8,484 ) 19.95 Outstanding, end of period 221,074 $ 17.78 $ 2,149 Options exercisable at period-end 169,507 $ 16.33 $ 1,893 Weighted-average fair value of options granted during the period (2) $ 10.13 (1) The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on June 30, 2018. This amount changes based on changes in the market value of the Company’s stock. (2) The fair value (present value of the estimated future benefit to the option holder) of each option grant is estimated on the date of grant using the Black-Scholes option pricing model.
Activity in Restricted Stock Awards and Restricted Stock Units	Activity in restricted stock awards and restricted stock units for the six months ended June 30, 2018 was as follows: June 30, 2018 Restricted Stock Awards Weighted Average Grant Price Outstanding, beginning of year 41,217 $ 18.35 Granted 6,611 27.15 Vested (14,615 ) 15.40 Forfeited/expired (2,521 ) 25.89 Outstanding, end of period 30,692 $ 21.04 June 30, 2018 Restricted Stock Units Weighted Average Grant Price Outstanding, beginning of year 8,691 $ 25.53 Granted 9,840 27.46 Issued (3,384 ) 23.66 Forfeited/expired — — Outstanding, end of period 15,147 $ 27.20

REGULATORY MATTERS (Tables)

REGULATORY MATTERS (Tables)	6 Months Ended
	Jun. 30, 2018
Regulatory Capital Requirements [Abstract]
Summary of Actual Capital Amount and Ratio of Company's and Bank's	The Company’s and the Bank’s actual capital amounts and ratios are presented in the following table: Actual Minimum For Capital Adequacy Purposes (a) Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) June 30, 2018 Total Capital (to risk weighted assets): Consolidated $ 203,514 15.57 % $ 129,089 9.875 % No t Bank 196,357 15.03 % 129,026 9.875 % $ 130,659 10.00 % Tier 1 Capital (to risk weighted assets): Consolidated 158,695 12.14 % 102,944 7.875 % Not applicable Bank 180,706 13.83 % 102,894 7.875 % 104,527 8.00 % Tier 1 Capital (to average assets): Consolidated 158,695 10.66 % 59,549 4.00 % Not applicable Bank 180,706 12.15 % 59,511 4.00 % 74,388 5.00 % Tier 1 Common Equity Ratio (to risk weighted assets): Consolidated 135,138 10.34 % 83,336 6.375 % Not applicable Bank 180,706 13.83 % 83,295 6.375 % 84,928 6.50 % December 31, 2017 Total Capital (to risk weighted assets): Consolidated $ 165,174 13.08 % $ 116,775 9.25 % Not applicable Bank 161,375 12.79 % 116,719 9.25 % $ 126,183 10.00 % Tier 1 Capital (to risk weighted assets): Consolidated 151,363 11.99 % 91,526 7.25 % Not applicable Bank 147,564 11.69 % 91,483 7.25 % 100,946 8.00 % Tier 1 Capital (to average assets): Consolidated 151,363 11.03 % 54,914 4.00 % Not applicable Bank 147,564 10.76 % 54,875 4.00 % 68,594 5.00 % Tier 1 Common Equity Ratio (to risk weighted assets): Consolidated 127,840 10.13 % 72,590 5.75 % Not applicable Bank 147,564 11.69 % 72,555 5.75 % 82,019 6.50 % (a) The ratios for June 30, 2018 and December 31, 2017 include a capital conservation buffer of 1.875% and 1.25%, respectively.

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on Recurring Basis	Assets measured at fair value on a recurring basis are summarized below: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (dollars in thousands) June 30, 2018 Securities available for sale: U.S. government and agency securities $ — $ 4,553 $ — $ 4,553 U.S. treasury Securities — 2,493 — 2,493 Municipal securities — 37,372 — 37,372 Mortgage-backed securities — 143,087 — 143,087 Derivative instruments, interest rate swaps — 51 — 51 Total assets at fair value $ — $ 187,556 $ — $ 187,556 December 31, 2017 Securities available for sale: U.S. government and agency securities $ — $ — $ — $ — Municipal securities — 26,634 — 26,634 Mortgage-backed securities — 70,744 — 70,744 Total assets at fair value $ — $ 97,378 $ — $ 97,378
Financial Instruments Carried on Consolidated Balance Sheet for Which Nonrecurring Change in Fair Value Has Been Recorded	The following table presents the financial instruments carried on the consolidated balance sheet by caption and by level in the fair value hierarchy for which a nonrecurring change in fair value has been recorded: Level 1 Inputs Level 2 Inputs Level 3 Inputs Impairment Losses (dollars in thousands) June 30, 2018 Impaired loans $ — $ — $ 47,082 $ 3,646 Other real estate owned — — 9,004 104 Total assets at fair value $ — $ — $ 56,086 $ 3,750 December 31, 2017 Impaired loans $ — $ — $ 33,002 $ 1,436 Other real estate owned — — 4,962 905 Total assets at fair value $ — $ — $ 37,964 $ 2,341
Significant Inputs Used in Fair Value Measurements for Level 3 Assets Measured on Nonrecurring Basis	The significant inputs used in the fair value measurements for Level 3 assets measured at fair value on a nonrecurring basis are as follows: June 30, 2018 Valuation Techniques Unobservable Inputs Range (Average) Impaired loans Evaluation of collateral Estimation of value NM* Other real estate owned Appraisal Appraisal adjustment 3%-39% (20%) December 31, 2017 Valuation Techniques Unobservable Inputs Range (Average) Impaired loans Evaluation of collateral Estimation of value NM* Other real estate owned Appraisal Appraisal adjustment 0%-39% (14%) Not Meaningful. Evaluations of the underlying assets are completed for each impaired loan with a specific reserve. The types of collateral vary widely and could include accounts receivable, inventory, a variety of equipment, and real estate. Collateral evaluations are reviewed and discounted as appropriate based on knowledge of the specific type of collateral. In the case of real estate, an independent appraisal may be obtained. Types of discounts considered include aging of receivables, condition of the collateral, potential market for the collateral, and estimated disposal costs. These discounts will vary from loan to loan, thus providing a range would not be meaningful.
Estimated Fair Values and Related Carrying or Notional Amounts of Financial Instruments	The estimated fair values, and related carrying or notional amounts, of the Company’s financial instruments were as follows: June 30, December 31, 2018 2017 Carrying Amount Fair Value Carrying Amount Fair Value Input Level (dollars in thousands) Financial assets: Cash and cash equivalents $ 81,044 $ 81,044 $ 66,771 $ 66,771 1 Securities available for sale 187,505 187,505 126,030 126,030 2 FHLB Stock 3,354 3,354 4,138 4,138 2 Loans, net of allowance for loan losses 1,166,395 1,160,060 1,135,704 1,135,861 3 Loans held for sale 11,468 11,468 6,575 6,575 3 Accrued interest receivable 4,874 4,874 3,793 3,793 2 Loan servicing rights 9,087 12,872 8,950 12,194 3 Derivative instruments, interest rate swaps 51 51 — — 2 Financial liabilities: Deposits: Time 834,102 826,471 706,500 709,219 3 Other deposits 376,329 362,117 403,577 401,503 1 Other borrowings 841 841 1,299 1,299 3 Advances from FHLB 108,200 107,007 121,500 121,793 3 Subordinated debentures 44,725 44,725 15,523 15,523 3 Accrued interest payable 2,699 2,699 2,389 2,389 2

OTHER REAL ESTATE OWNED (Tables

OTHER REAL ESTATE OWNED (Tables)	6 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
Schedule of Other Real Estate Owned	Changes in other real estate owned were as follows: For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Balance, beginning of period $ 9,379 $ 6,995 $ 4,962 $ 3,161 Assets foreclosed 1,687 — 6,104 4,512 Write-down of other real estate owned (104 ) (78 ) (104 ) (78 ) Net gain on sales of other real estate owned 149 27 149 402 Proceeds from sale of other real estate owned (2,107 ) (27 ) (2,107 ) (1,080 ) Balance, end of period $ 9,004 $ 6,917 $ 9,004 $ 6,917
Expenses (Income) Applicable to Other Real Estate Owned Included in Non-Interest Expense	Expenses (income) applicable to other real estate owned included in non-interest expense include the following: For the Three Months Ended For the Six Months Ended June 30, June 30, 2018 2017 2018 2017 (dollars in thousands) Net gain on sales of other real estate owned $ (149 ) $ (27 ) $ (149 ) $ (402 ) Write-down of other real estate owned 104 78 104 78 Operating expenses, net of rental income 108 25 216 69 $ 63 $ 76 $ 171 $ (255 )

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - Security	Jun. 15, 2018	Jun. 30, 2018
Interest Rate Swap
Basis Of Presentation [Line Items]
Number of trust preferred securities	2	2

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income from continuing operations	$ 3,850	$ 2,058	$ 7,904	$ 4,690
Less: preferred stock dividends	99	85	196	166
Income available to common shareholders for basic earnings per common share	$ 3,751	$ 1,973	$ 7,708	$ 4,524
Average number of common shares issued	7,351,985	7,328,282	7,349,923	7,323,885
Less: weighted average treasury shares	442,102	432,861	440,974	432,484
Less: weighted average nonvested equity incentive plan shares	219,315	266,186	224,550	278,810
Weighted average number of common shares outstanding	6,690,568	6,629,235	6,684,399	6,612,591
Effect of dilutive options	79,368	84,958	77,518	88,987
Weighted average number of common shares outstanding used to calculate diluted earnings per common share	6,769,936	6,714,193	6,761,917	6,701,578

Securities Available-for-Sale -

Securities Available-for-Sale - Schedule of Amortized Cost and Fair Value of Available-for-Sale of Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 191,347	$ 127,065
Unrealized Gains	108	202
Unrealized Losses	(3,950)	(1,237)
Fair Value	187,505	126,030
U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,599	4,874
Unrealized Gains		82
Unrealized Losses	(46)
Fair Value	4,553	4,956
US Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,496
Unrealized Losses	(3)
Fair Value	2,493
Municipal securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	38,090	33,949
Unrealized Gains	10	56
Unrealized Losses	(728)	(240)
Fair Value	37,372	33,765
Mortgage-backed securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	146,162	88,242
Unrealized Gains	98	64
Unrealized Losses	(3,173)	(997)
Fair Value	$ 143,087	$ 87,309

Securities Available-for-Sale39

Securities Available-for-Sale - Schedule of Amortized Cost and Fair Value of Securities Available for Sale by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available For Sale Securities [Abstract]
Due in one year or less, Amortized Cost	$ 8,799	$ 7,990
Due from one to five years, Amortized Cost	9,759	10,494
Due from five to ten years, Amortized Cost	8,502	11,482
Due after ten years, Amortized Cost	18,125	8,857
Mortgage-backed securities, Amortized Cost	146,162	88,242
Amortized Cost	191,347	127,065
Due in one year or less, Fair Value	8,784	7,980
Due from one to five years, Fair Value	9,637	10,470
Due from five to ten years, Fair Value	8,367	11,494
Due after ten years, Fair Value	17,630	8,777
Mortgage-backed securities, Fair Value	143,087	87,309
Fair Value	$ 187,505	$ 126,030

Securities Available-for-Sale40

Securities Available-for-Sale - Additional Information (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
FHLB Stock, at cost	$ 3,354,000	$ 4,138,000
Reported Value Measurement
Schedule Of Available For Sale Securities [Line Items]
FHLB Stock, at cost	3,400,000	4,100,000
Reported Value Measurement | Collateralized Federal Home Loan Bank Advances
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Pledged as Collateral	0	0
Reported Value Measurement | Federal Reserve Bank Line Of Credit
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Pledged as Collateral	$ 0	$ 8,600,000

Securities Available-for-Sale41

Securities Available-for-Sale - Schedule of Fair Value and Gross Unrealized Losses of Entity's Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Investments with unrealized losses less than 12 months, fair value	$ 142,861	$ 79,558
Investments with unrealized losses less than 12 months, unrealized losses	(3,203)	(745)
Investments with unrealized losses 12 months or greater, fair value	15,530	17,820
Investments with unrealized losses 12 months or greater, unrealized losses	(747)	(492)
Investments with unrealized losses, fair value	158,391	97,378
Investments with unrealized losses, unrealized losses	(3,950)	(1,237)
US Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Investments with unrealized losses less than 12 months, fair value	2,493
Investments with unrealized losses less than 12 months, unrealized losses	(3)
Investments with unrealized losses, fair value	2,493
Investments with unrealized losses, unrealized losses	(3)
Municipal securities
Schedule Of Available For Sale Securities [Line Items]
Investments with unrealized losses less than 12 months, fair value	32,976	25,280
Investments with unrealized losses less than 12 months, unrealized losses	(711)	(224)
Investments with unrealized losses 12 months or greater, fair value	899	1,354
Investments with unrealized losses 12 months or greater, unrealized losses	(17)	(16)
Investments with unrealized losses, fair value	33,875	26,634
Investments with unrealized losses, unrealized losses	(728)	(240)
Mortgage-backed securities
Schedule Of Available For Sale Securities [Line Items]
Investments with unrealized losses less than 12 months, fair value	102,839	54,278
Investments with unrealized losses less than 12 months, unrealized losses	(2,443)	(521)
Investments with unrealized losses 12 months or greater, fair value	14,631	16,466
Investments with unrealized losses 12 months or greater, unrealized losses	(730)	(476)
Investments with unrealized losses, fair value	117,470	70,744
Investments with unrealized losses, unrealized losses	(3,173)	$ (997)
U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Investments with unrealized losses less than 12 months, fair value	4,553
Investments with unrealized losses less than 12 months, unrealized losses	(46)
Investments with unrealized losses, fair value	4,553
Investments with unrealized losses, unrealized losses	$ (46)

Loans - Components of Loans (De

Loans - Components of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Agricultural loans	$ 702,426	$ 686,430
Commercial real estate loans	289,184	292,704
Commercial loans	118,425	114,332
Residential real estate loans	71,150	55,138
Installment and consumer other	339	347
Total gross loans	1,181,524	1,148,951
Allowance for loan losses	(15,129)	(13,247)	$ (13,503)	$ (12,645)
Net loans	$ 1,166,395	$ 1,135,704

Loans - Changes in Allowance fo

Loans - Changes in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	$ 13,247	$ 12,645
Provision for loan losses	630	2,285
Loans charged off	(42)	(1,492)
Recoveries	1,294	65
Balance, end of period	15,129	13,503
Agricultural
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	9,712	8,173
Provision for loan losses	1,915	1,029
Recoveries	1	1
Balance, end of period	11,628	9,203
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	1,978	2,762
Provision for loan losses	(1,284)	473
Loans charged off	(42)	(575)
Recoveries	1,251	36
Balance, end of period	1,903	2,696
Commercial
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	1,508	1,239
Provision for loan losses	3	1,028
Loans charged off		(917)
Recoveries	41	28
Balance, end of period	1,552	1,378
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	47	470
Provision for loan losses	(3)	(246)
Balance, end of period	44	224
Installment and Consumer Other
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of year	2	1
Provision for loan losses	(1)	1
Recoveries	1
Balance, end of period	$ 2	$ 2

Loans - Balances in Allowance f

Loans - Balances in Allowance for Loan Losses and Recorded Balance in Loans by Portfolio Segment and Based on Impairment Method (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Loans individually evaluated for impairment	$ 43,436	$ 31,566
Loans collectively evaluated for impairment	1,122,959	1,104,138
Net loans	1,166,395	1,135,704
Allowance for loan losses:
Allowance for loan losses individually evaluated for impairment	3,646	1,436
Allowance for loan losses collectively evaluated for impairment	11,483	11,811
Total	15,129	13,247
Loans:
Loans individually evaluated for impairment	47,082	33,002
Loans collectively evaluated for impairment	1,134,442	1,115,949
Total gross loans	1,181,524	1,148,951
Agricultural Loans
Allowance for loan losses:
Allowance for loan losses individually evaluated for impairment	2,855	1,026
Allowance for loan losses collectively evaluated for impairment	8,773	8,686
Total	11,628	9,712
Loans:
Loans individually evaluated for impairment	42,838	28,744
Loans collectively evaluated for impairment	659,588	657,686
Total gross loans	702,426	686,430
Commercial Real Estate Loans
Allowance for loan losses:
Allowance for loan losses individually evaluated for impairment	10
Allowance for loan losses collectively evaluated for impairment	1,893	1,978
Total	1,903	1,978
Loans:
Loans individually evaluated for impairment	2,366	2,465
Loans collectively evaluated for impairment	286,818	290,239
Total gross loans	289,184	292,704
Commercial Loans
Allowance for loan losses:
Allowance for loan losses individually evaluated for impairment	781	410
Allowance for loan losses collectively evaluated for impairment	771	1,098
Total	1,552	1,508
Loans:
Loans individually evaluated for impairment	1,878	1,793
Loans collectively evaluated for impairment	116,547	112,539
Total gross loans	118,425	114,332
Residential Real Estate Loans
Allowance for loan losses:
Allowance for loan losses collectively evaluated for impairment	44	47
Total	44	47
Loans:
Loans collectively evaluated for impairment	71,150	55,138
Total gross loans	71,150	55,138
Installment and consumer other
Allowance for loan losses:
Allowance for loan losses collectively evaluated for impairment	2	2
Total	2	2
Loans:
Loans collectively evaluated for impairment	339	347
Total gross loans	$ 339	$ 347

Loans - Schedule of Aging of Re

Loans - Schedule of Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	$ 14,192	$ 11,150
Loans Not Past Due	1,167,332	1,137,801
Total gross loans	1,181,524	1,148,951
Financing Receivables 30 To 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	3,517	1,540
Financing Receivables 60 To 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,511
Financing Receivables Equal To Greater Than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	9,164	9,610
Agricultural Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	7,621	7,295
Loans Not Past Due	694,805	679,135
Total gross loans	702,426	686,430
Agricultural Loans | Financing Receivables 30 To 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,132	476
Agricultural Loans | Financing Receivables 60 To 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	780
Agricultural Loans | Financing Receivables Equal To Greater Than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	5,709	6,819
Commercial Real Estate Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	4,751	2,149
Loans Not Past Due	284,433	290,555
Total gross loans	289,184	292,704
Commercial Real Estate Loans | Financing Receivables 30 To 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	2,385
Commercial Real Estate Loans | Financing Receivables Equal To Greater Than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	2,366	2,149
Commercial Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,820	1,706
Loans Not Past Due	116,605	112,626
Total gross loans	118,425	114,332
Commercial Loans | Financing Receivables 30 To 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		1,064
Commercial Loans | Financing Receivables 60 To 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	731
Commercial Loans | Financing Receivables Equal To Greater Than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,089	642
Residential Real Estate Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	71,150	55,138
Total gross loans	71,150	55,138
Installment and consumer other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	339	347
Total gross loans	$ 339	$ 347

Loans - Nonaccrual, Restructure

Loans - Nonaccrual, Restructured and Certain Past Due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual loans, past due	$ 14,192	$ 11,150
Restructured loans not on nonaccrual status	11,173	9,019
Total	37,478	20,578
Financing Receivables Equal To Greater Than 90 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual loans, past due	9,164	9,610
Financing Receivables 30 To 89 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual loans, past due	1,778	1,493
Financing Receivables 1 To 29 Days Past Due
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual loans, past due	$ 15,363	$ 456

Loans - Average Recorded Invest

Loans - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 40,042	$ 17,490
Interest Income Recognized	1,448	177
Agricultural Loans
Financing Receivable Impaired [Line Items]
Average Recorded Investment	35,791	10,810
Interest Income Recognized	1,417	113
Commercial Real Estate Loans
Financing Receivable Impaired [Line Items]
Average Recorded Investment	2,416	4,392
Interest Income Recognized	6	60
Commercial Loans
Financing Receivable Impaired [Line Items]
Average Recorded Investment	1,836	2,254
Interest Income Recognized	$ 25	4
Residential Real Estate Loans
Financing Receivable Impaired [Line Items]
Average Recorded Investment		$ 34

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Impaired loans on nonaccrual and restructured loans that are past due and still accruing	90 days
Interest income recognized for nonaccrual loans	$ 1,000,000	$ 500,000
Specific reserve to customers whose loan terms have been modified in TDR	1,400,000		$ 900,000
Additional lending commitments to customers with outstanding loans that are classified as TDRs	0		0
Minimum exposure for annual internal credit review	300,000
Federal Reserve Bank Of Chicago
Accounts Notes And Loans Receivable [Line Items]
Loans pledged as collateral	249,000,000		$ 0
Federal Reserve Bank Of Chicago | Maximum
Accounts Notes And Loans Receivable [Line Items]
Line-of-credit unused portion	$ 186,700,000

Loans - TDRs by Loan Class (Det

Loans - TDRs by Loan Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Restructured and Accruing	$ 11,173	$ 9,019
Total	5,375		$ 546
TDR Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Non-Accrual	6,459	4,397
Restructured and Accruing	11,173	9,019
Total	17,632	13,416
Agricultural Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Total	5,375		$ 546
Agricultural Loans | TDR Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Non-Accrual	6,136	3,822
Restructured and Accruing	11,150	8,668
Total	17,286	12,490
Commercial Real Estate Loans | TDR Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Non-Accrual	323	575
Restructured and Accruing		316
Total	323	891
Commercial Loans | TDR Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Restructured and Accruing	23	35
Total	$ 23	$ 35

Loans - Number of Loans Modifie

Loans - Number of Loans Modified in Troubled Debt Restructuring Investment by Class (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)Loan	Jun. 30, 2017USD ($)Loan
Accounts Notes And Loans Receivable [Line Items]
Number of Loans | Loan	15	3
Recorded Investment | $	$ 5,375	$ 546
Agricultural Loans
Accounts Notes And Loans Receivable [Line Items]
Number of Loans | Loan	15	3
Recorded Investment | $	$ 5,375	$ 546

Loans - Summary of Troubled Deb

Loans - Summary of Troubled Debt Restructurings Grouped by Type of Concession (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)Loan	Jun. 30, 2017USD ($)Loan
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Loans | Loan	15	3
Recorded Investment | $	$ 5,375	$ 546
Agricultural Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Loans | Loan	15	3
Recorded Investment | $	$ 5,375	$ 546
Agricultural Loans | Payment Concessions
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Loans | Loan	9	2
Recorded Investment | $	$ 3,744	$ 221
Agricultural Loans | Extension of Interest-Only Payments
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Loans | Loan	6
Recorded Investment | $	$ 1,631
Agricultural Loans | Combination of Extension of Term and Interest Rate Concessions
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Loans | Loan		1
Recorded Investment | $		$ 325

Loans - Risk Category of Loans

Loans - Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long Term Debt [Line Items]
Agricultural loans	$ 702,426	$ 686,430
Commercial real estate loans	289,184	292,704
Commercial loans	118,425	114,332
Residential real estate loans	71,150	55,138
Installment and consumer other	339	347
Total gross loans	1,181,524	1,148,951
Sound/ Acceptable/ Satisfactory/ Low Satisfactory
Long Term Debt [Line Items]
Agricultural loans	492,010	503,292
Commercial real estate loans	239,625	225,898
Commercial loans	97,225	93,347
Residential real estate loans	67,310	50,917
Installment and consumer other	339	347
Total gross loans	896,509	873,801
Watch
Long Term Debt [Line Items]
Agricultural loans	130,625	115,374
Commercial real estate loans	35,196	50,043
Commercial loans	16,738	13,384
Residential real estate loans	3,840	4,221
Total gross loans	186,399	183,022
Special Mention
Long Term Debt [Line Items]
Agricultural loans	4,193	3,443
Commercial real estate loans	590	4,574
Commercial loans		885
Total gross loans	4,783	8,902
Substandard Performing
Long Term Debt [Line Items]
Agricultural loans	32,760	35,577
Commercial real estate loans	11,407	9,724
Commercial loans	2,584	4,923
Total gross loans	46,751	50,224
Substandard Impaired
Long Term Debt [Line Items]
Agricultural loans	42,838	28,744
Commercial real estate loans	2,366	2,465
Commercial loans	1,878	1,793
Total gross loans	$ 47,082	$ 33,002

Loan Servicing Rights - Additio

Loan Servicing Rights - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance of mortgage	$ 628.4	$ 600.7
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate	10.00%
Level 3 Inputs
Servicing Assets at Fair Value [Line Items]
Loan servicing rights, fair value	$ 12.9	$ 12.5
Minimum
Servicing Assets at Fair Value [Line Items]
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, Prepayment speed	4.00%
Maximum
Servicing Assets at Fair Value [Line Items]
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, Prepayment speed	9.00%

Loan Servicing Rights - Summary

Loan Servicing Rights - Summary of Servicing Rights Capitalized and Amortized along with the Aggregate Activity in Related Valuation (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Transfers And Servicing [Abstract]
Balance, beginning of period	$ 8,950	$ 9,264
Additions	1,713	2,431
Disposals	(486)	(564)
Amortization	(1,090)	(2,181)
Balance, end of period	$ 9,087	$ 8,950

Goodwill and Core Deposit Int55

Goodwill and Core Deposit Intangible - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 5,038	$ 5,038
Fox River Valley
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 5,000	5,000
Core Deposit
Goodwill And Intangible Assets [Line Items]
Intangible assets, amortization period on accelerated basis	66 months
Accumulated amortization	$ 1,100	882
Core Deposit | Fox River Valley
Goodwill And Intangible Assets [Line Items]
Gross carrying amount of intangible assets	1,801	1,801
Accumulated amortization	$ 1,100	$ 882

Goodwill and Core Deposit Int56

Goodwill and Core Deposit Intangible - Core Deposit Intangible (Detail) - Core Deposit - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Core deposit intangible:
Accumulated amortization	$ (1,100)	$ (882)
Net book value	701	919
Fox River Valley
Core deposit intangible:
Gross carrying amount	1,801	1,801
Accumulated amortization	(1,100)	(882)
Net book value	$ 701	$ 919

Deposits - Summary of Deposits

Deposits - Summary of Deposits (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deposits [Abstract]
Demand deposits	$ 95,459	$ 125,584
Savings	280,870	277,993
Certificates of deposit	834,102	706,500
Total deposits	$ 1,210,431	$ 1,110,077

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Deposits [Abstract]
Brokered deposits	$ 323.6	$ 282.6

Advances From FHLB and Other 59

Advances From FHLB and Other Borrowings - Additional Information (Detail) - USD ($)	Sep. 14, 2017	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Advances from FHLB		$ 121,500,000	$ 108,200,000	$ 121,500,000
Irrevocable letters of credit		0	0	0
Other borrowings		1,299,000	841,000	1,299,000
Fox River Valley
Debt Instrument [Line Items]
Capital lease monthly rental payments			$ 15,000
Lease expiration date			Apr. 30, 2018
Capital lease obligations		$ 41,000	$ 0	41,000
Amortization of capital lease			41,000	148,000
Lease expiration date extended		2019-04
Lease monthly rental payments		$ 16,000
Collateralized Loan Obligations
Debt Instrument [Line Items]
Other borrowings		1,300,000	800,000	1,300,000
Federal Reserve Bank Of Chicago
Debt Instrument [Line Items]
Line of credit amount outstanding			186,700,000
Other borrowings		0	0	0
Federal Reserve Bank Of Chicago | Securities Pledged as Collateral
Debt Instrument [Line Items]
Available line-of-credit		8,600,000		8,600,000
U.S. Bank National Association | Revolving Line-of-Credit Facility
Debt Instrument [Line Items]
Line of credit amount outstanding		$ 0	$ 0	$ 0
Line of credit facility agreement date	Sep. 14, 2017
Line of credit facility maximum borrowing capacity	$ 15,000,000
Line of credit, non-usage fee percentage per annum	0.275%
U.S. Bank National Association | Revolving Line-of-Credit Facility | One month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%

Advances from FHLB and Other 60

Advances from FHLB and Other Borrowings - Advances Outstanding from FHLB (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Advances from FHLB	$ 108,200	$ 121,500
Fixed rate, short term, Advance for FHLB, 1
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jan. 2, 2018
Advances from FHLB, Rate	1.23%
Advances from FHLB		1,000
Fixed rate, fixed term, Advance for FHLB, 2
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jan. 12, 2018
Advances from FHLB, Rate	0.85%
Advances from FHLB		8,000
Fixed rate, fixed term, Advance for FHLB, 3
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Feb. 12, 2018
Advances from FHLB, Rate	0.91%
Advances from FHLB		5,000
Fixed rate, fixed term, Advance for FHLB, 4
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Apr. 23, 2018
Advances from FHLB, Rate	1.07%
Advances from FHLB		2,300
Fixed rate, fixed term, Advance for FHLB, 5
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jun. 18, 2018
Advances from FHLB, Rate	0.93%
Advances from FHLB		10,000
Fixed rate, fixed term, Advance for FHLB, 6
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jul. 16, 2018
Advances from FHLB, Rate	1.21%
Advances from FHLB	$ 762	762
Fixed rate, fixed term, Advance for FHLB, 7
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jul. 16, 2018
Advances from FHLB, Rate	1.21%
Advances from FHLB	$ 1,038	1,038
Fixed rate, fixed term, Advance for FHLB, 8
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jul. 19, 2018
Advances from FHLB, Rate	1.41%
Advances from FHLB	$ 15,000	15,000
Fixed rate, fixed term, Advance for FHLB, 9
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 20, 2018
Advances from FHLB, Rate	1.15%
Advances from FHLB	$ 1,000	1,000
Fixed rate, fixed term, Advance for FHLB, 10
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 20, 2018
Advances from FHLB, Rate	1.15%
Advances from FHLB	$ 800	800
Fixed rate, fixed term, Advance for FHLB, 11
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 20, 2018
Advances from FHLB, Rate	1.27%
Advances from FHLB	$ 2,200	2,200
Fixed rate, fixed term, Advance for FHLB, 12
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Nov. 9, 2018
Advances from FHLB, Rate	1.47%
Advances from FHLB	$ 10,000	10,000
Fixed rate, fixed term, Advance for FHLB, 13
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Dec. 31, 2018
Advances from FHLB, Rate	1.65%
Advances from FHLB	$ 3,000	3,000
Fixed rate, fixed term, Advance for FHLB, 14
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Feb. 27, 2019
Advances from FHLB, Rate	1.47%
Advances from FHLB	$ 5,000	5,000
Fixed rate, fixed term, Advance for FHLB, 15
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Mar. 8, 2019
Advances from FHLB, Rate	1.54%
Advances from FHLB	$ 10,000	10,000
Fixed rate, fixed term, Advance for FHLB, 16
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jul. 15, 2019
Advances from FHLB, Rate	1.11%
Advances from FHLB	$ 8,000	8,000
Fixed rate, fixed term, Advance for FHLB, 17
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 12, 2019
Advances from FHLB, Rate	2.24%
Advances from FHLB	$ 5,000
Fixed rate, fixed term, Advance for FHLB, 18
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 14, 2019
Advances from FHLB, Rate	1.77%
Advances from FHLB	$ 2,000	2,000
Fixed rate, fixed term, Advance for FHLB, 19
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Feb. 20, 2020
Advances from FHLB, Rate	1.71%
Advances from FHLB	$ 5,000	5,000
Fixed rate, fixed term, Advance for FHLB, 20
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jul. 16, 2020
Advances from FHLB, Rate	1.85%
Advances from FHLB	$ 800	800
Fixed rate, fixed term, Advance for FHLB, 21
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 25, 2020
Advances from FHLB, Rate	1.84%
Advances from FHLB	$ 3,000	3,000
Fixed rate, fixed term, Advance for FHLB, 22
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 27, 2020
Advances from FHLB, Rate	1.88%
Advances from FHLB	$ 5,000	5,000
Fixed rate, fixed term, Advance for FHLB, 23
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Dec. 30, 2020
Advances from FHLB, Rate	2.09%
Advances from FHLB	$ 4,000	4,000
Fixed rate, fixed term, Advance for FHLB, 24
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Dec. 31, 2020
Advances from FHLB, Rate	1.94%
Advances from FHLB	$ 600	600
Fixed rate, fixed term, Advance for FHLB, 25
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Apr. 12, 2021
Advances from FHLB, Rate	1.92%
Advances from FHLB	$ 8,000	8,000
Fixed rate, fixed term, Advance for FHLB, 26
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jun. 15, 2021
Advances from FHLB, Rate	1.39%
Advances from FHLB	$ 5,000	5,000
Fixed rate, fixed term, Advance for FHLB, 27
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Aug. 16, 2021
Advances from FHLB, Rate	2.29%
Advances from FHLB	$ 3,000	3,000
Fixed rate, fixed term, Advance for FHLB, 28
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Dec. 30, 2021
Advances from FHLB, Rate	2.29%
Advances from FHLB	$ 2,000	$ 2,000
Fixed rate, putable, no call 2 years
Debt Instrument [Line Items]
Advances from FHLB, Maturity	Jan. 12, 2023
Advances from FHLB, Rate	2.03%
Advances from FHLB	$ 8,000

Advances from FHLB and Other 61

Advances from FHLB and Other Borrowings - Future Maturities of FHLB Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Federal Home Loan Banks [Abstract]
1 year or less	$ 48,800	$ 60,100
1 to 2 years	20,000	25,000
2 to 3 years	26,400	18,400
3 to 4 years	5,000	18,000
Over 4 years	8,000
Advances from FHLB	$ 108,200	$ 121,500

Advances from FHLB and Other 62

Advances from FHLB and Other Borrowings - Balances and Interest Rates on Other Borrowings (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Other Borrowings:
Balance outstanding at end of period	$ 841	$ 1,299
Average amount outstanding during the period	1,226	1,545
Maximum amount outstanding at any month end	$ 1,278	$ 1,825
Weighted average interest rate during the period	4.94%	5.77%
Weighted average interest rate at end of period	4.51%	6.41%

Subordinated Debentures - Addit

Subordinated Debentures - Additional Information (Detail) - Subordinated Notes - USD ($)	May 30, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Aggregate principal amount of note sold and issued	$ 30,000
Fixed-to-floating rate	5.875%
Maturity date	Jun. 1, 2028
Debt instrument sale price to face amount percentage	100.00%
Fixed interest rate	5.875%
Frequency of interest payment		quarterly
LIBOR
Debt Instrument [Line Items]
Description of variable rate basis		3-month LIBOR
Basis spread on variable rate	2.884%

Equity Incentive Plan - Additio

Equity Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended		24 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 259	$ 239
Unrecognized share-based compensation expense related to nonvested options and restricted stock awards amounted	$ 800		$ 800
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option term	10 years
Maximum | Equity Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	5 years
Minimum | Equity Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock granted under plan	6,611
Restricted Stock Awards | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	5 years
Restricted Stock Awards | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year
Stock Options And Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 259	$ 239
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to nonvested options and restricted stock award amounted, weighted average period of recognition	1 year 10 months 24 days
2016 Long Term Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options granted under plan	13,832		84,747
2016 Long Term Incentive Plan | Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock granted under plan			84,747

Equity Incentive Plan - Status

Equity Incentive Plan - Status and Changes in Stock Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended		24 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018
Number of Options
Options, Exercised		(12,592)	(48,584)
2016 Long Term Incentive Plan
Number of Options
Options, Outstanding beginning of year		228,318
Options, Granted		13,832		84,747
Options, Exercised		(12,592)
Options, Forfeited/expired		(8,484)
Options, Outstanding end of period		221,074		221,074
Options exercisable at period-end		169,507		169,507
Weighted-Average Exercise Price
Weighted Average Exercise price, Outstanding, beginning of year		$ 17.24
Weighted Average Exercise Price, Granted		26.83
Weighted Average Exercise Price, Exercised		16.42
Weighted Average Exercise Price, Forfeited/expired		19.95
Weighted Average Exercise Price, Outstanding, end of period		17.78		$ 17.78
Weighted Average Exercise Price, Options exercisable at period-end		16.33		$ 16.33
Weighted-average fair value of options granted during the period	[1]	$ 10.13
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding, end of period	[2]	$ 2,149		$ 2,149
Aggregate Intrinsic Value, Options exercisable at period-end	[2]	$ 1,893		$ 1,893
[1]	The fair value (present value of the estimated future benefit to the option holder) of each option grant is estimated on the date of grant using the Black-Scholes option pricing model.
[2]	The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on June 30, 2018. This amount changes based on changes in the market value of the Company’s stock.

Equity Incentive Plan - Activit

Equity Incentive Plan - Activity in Restricted Stock Awards and Restricted Stock Units (Detail)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Restricted Stock Awards
Number of Non-Vested Shares
Outstanding, beginning of year | shares	41,217
Granted | shares	6,611
Vested | shares	(14,615)
Forfeited/expired | shares	(2,521)
Outstanding, end of period | shares	30,692
Weighted Average Grant Date Fair Value
Weighted Average Grant Price Outstanding, Beginning of year | $ / shares	$ 18.35
Weighted Average Grant Price Outstanding, Granted | $ / shares	27.15
Weighted Average Grant Price, Vested | $ / shares	15.40
Weighted Average Grant Price, Forfeited or expired | $ / shares	25.89
Weighted Average Grant Price Outstanding, End of year | $ / shares	$ 21.04
Restricted Stock Units
Number of Non-Vested Shares
Outstanding, beginning of year | shares	8,691
Granted | shares	9,840
Issued | shares	(3,384)
Outstanding, end of period | shares	15,147
Weighted Average Grant Date Fair Value
Weighted Average Grant Price Outstanding, Beginning of year | $ / shares	$ 25.53
Weighted Average Grant Price Outstanding, Granted | $ / shares	27.46
Weighted Average Grant Price Outstanding, Issued | $ / shares	23.66
Weighted Average Grant Price Outstanding, End of year | $ / shares	$ 27.20

Regulatory Matters - Summary of

Regulatory Matters - Summary of Actual Capital Amounts and Ratios of Company's and Bank's (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk weighted assets), Actual Amount		$ 203,514	$ 165,174
Total Capital (to risk weighted assets), Actual Ratio		15.57%	13.08%
Total Capital (to risk weighted assets), Minimum For Capital Adequacy Purpose, Amount	[1]	$ 129,089	$ 116,775
Total Capital (to risk weighted assets), Minimum For Capital Adequacy Purpose, Ratio	[1]	9.875%	9.25%
Tier 1 Capital (to risk weighted assets), Actual Amount		$ 158,695	$ 151,363
Tier 1 Capital (to risk weighted assets), Actual Ratio		12.14%	11.99%
Tier 1 Capital (to risk weighted assets), Minimum For Capital Adequacy Purposes, Amount	[1]	$ 102,944	$ 91,526
Tier 1 Capital (to risk weighted assets), Minimum For Capital Adequacy Purposes, Ratio	[1]	7.875%	7.25%
Tier 1 Capital (to average assets), Actual Amount		$ 158,695	$ 151,363
Tier 1 Capital (to average assets), Actual Ratio		10.66%	11.03%
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Amount	[1]	$ 59,549	$ 54,914
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Ratio	[1]	4.00%	4.00%
Tier 1 Common Equity (to risk weighted assets), Actual Amount		$ 135,138	$ 127,840
Tier 1 Common Equity (to risk weighted assets), Actual Ratio		10.34%	10.13%
Tier 1 Common Equity (to risk weighted assets), Minimum For Capital Adequacy Purposes, Amount	[1]	$ 83,336	$ 72,590
Tier 1 Common Equity (to risk weighted assets), Minimum For Capital Adequacy Purposes, Ratio	[1]	6.375%	5.75%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk weighted assets), Actual Amount		$ 196,357	$ 161,375
Total Capital (to risk weighted assets), Actual Ratio		15.03%	12.79%
Total Capital (to risk weighted assets), Minimum For Capital Adequacy Purpose, Amount	[1]	$ 129,026	$ 116,719
Total Capital (to risk weighted assets), Minimum For Capital Adequacy Purpose, Ratio	[1]	9.875%	9.25%
Total Capital (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		$ 130,659	$ 126,183
Total Capital (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		10.00%	10.00%
Tier 1 Capital (to risk weighted assets), Actual Amount		$ 180,706	$ 147,564
Tier 1 Capital (to risk weighted assets), Actual Ratio		13.83%	11.69%
Tier 1 Capital (to risk weighted assets), Minimum For Capital Adequacy Purposes, Amount	[1]	$ 102,894	$ 91,483
Tier 1 Capital (to risk weighted assets), Minimum For Capital Adequacy Purposes, Ratio	[1]	7.875%	7.25%
Tier 1 Capital (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		$ 104,527	$ 100,946
Tier 1 Capital (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets), Actual Amount		$ 180,706	$ 147,564
Tier 1 Capital (to average assets), Actual Ratio		12.15%	10.76%
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Amount	[1]	$ 59,511	$ 54,875
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Ratio	[1]	4.00%	4.00%
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Amount		$ 74,388	$ 68,594
Tier 1 Capital (to average assets), Minimum To Be Adequately Capitalized Under Prompt Corrective Action Provisions, Ratio		5.00%	5.00%
Tier 1 Common Equity (to risk weighted assets), Actual Amount		$ 180,706	$ 147,564
Tier 1 Common Equity (to risk weighted assets), Actual Ratio		13.83%	11.69%
Tier 1 Common Equity (to risk weighted assets), Minimum For Capital Adequacy Purposes, Amount	[1]	$ 83,295	$ 72,555
Tier 1 Common Equity (to risk weighted assets), Minimum For Capital Adequacy Purposes, Ratio	[1]	6.375%	5.75%
Tier 1 Common Equity (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		$ 84,928	$ 82,019
Tier 1 Common Equity (to risk weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		6.50%	6.50%
[1]	The ratios for June 30, 2018 and December 31, 2017 include a capital conservation buffer of 1.875% and 1.25%, respectively.

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 187,505	$ 126,030
Fair Value on a Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	187,556	97,378
Fair Value on a Recurring Basis | Interest Rate Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	51
Fair Value on a Recurring Basis | U.S. Government and Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	4,553
Fair Value on a Recurring Basis | US Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	2,493
Fair Value on a Recurring Basis | Municipal securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	37,372	26,634
Fair Value on a Recurring Basis | Mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	143,087	70,744
Fair Value on a Recurring Basis | Level 2 Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	187,556	97,378
Fair Value on a Recurring Basis | Level 2 Inputs | Interest Rate Swap
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	51
Fair Value on a Recurring Basis | Level 2 Inputs | U.S. Government and Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	4,553
Fair Value on a Recurring Basis | Level 2 Inputs | US Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	2,493
Fair Value on a Recurring Basis | Level 2 Inputs | Municipal securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	37,372	26,634
Fair Value on a Recurring Basis | Level 2 Inputs | Mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 143,087	$ 70,744

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Carried on Consolidated Balance Sheet for Which Nonrecurring Change in Fair Value Has Been Recorded (Detail) - Fair Value on a Nonrecurring Basis - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment Losses	$ 3,750	$ 2,341
Impaired Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment Losses	3,646	1,436
Other Real Estate Owned
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment Losses	104	905
Level 3 Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets at fair value	56,086	37,964
Level 3 Inputs | Impaired Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets at fair value	47,082	33,002
Level 3 Inputs | Other Real Estate Owned
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets at fair value	$ 9,004	$ 4,962

Fair Value Measurements - Signi

Fair Value Measurements - Significant Inputs Used in Fair Value Measurements for Level 3 Assets Measured on Nonrecurring Basis (Detail) - Level 3 Inputs	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Impaired Loans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Valuation Techniques	icbk:EvaluationOfCollateralMember	icbk:EvaluationOfCollateralMember
Unobservable Inputs	Estimation of value	Estimation of value
Other Real Estate Owned
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Valuation Techniques	icbk:AppraisalMember	icbk:AppraisalMember
Unobservable Inputs	Appraisal adjustment	Appraisal adjustment
Other Real Estate Owned | Minimum | Measurement Input, Comparability Adjustment
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Range (Average)	0.03	0
Other Real Estate Owned | Maximum | Measurement Input, Comparability Adjustment
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Range (Average)	0.39	0.39
Other Real Estate Owned | Weighted Average | Measurement Input, Comparability Adjustment
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Range (Average)	(0.20)	0.14

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values and Related Carrying or Notional Amounts of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financial assets:
Securities available for sale	$ 187,505	$ 126,030
Level 3 Inputs
Financial assets:
Loan servicing rights	12,900	12,500
Carrying Amount | Level 1 Inputs
Financial assets:
Cash and cash equivalents	81,044	66,771
Carrying Amount | Level 2 Inputs
Financial assets:
Securities available for sale	187,505	126,030
FHLB Stock	3,354	4,138
Accrued interest receivable	4,874	3,793
Derivative instruments, interest rate swaps	51
Financial liabilities:
Accrued interest payable	2,699	2,389
Carrying Amount | Level 3 Inputs
Financial assets:
Loans, net of allowance for loan losses	1,166,395	1,135,704
Loans held for sale	11,468	6,575
Loan servicing rights	9,087	8,950
Financial liabilities:
Other borrowings	841	1,299
Advances from FHLB	108,200	121,500
Subordinated debentures	44,725	15,523
Fair Value | Level 1 Inputs
Financial assets:
Cash and cash equivalents	81,044	66,771
Fair Value | Level 2 Inputs
Financial assets:
Securities available for sale	187,505	126,030
FHLB Stock	3,354	4,138
Accrued interest receivable	4,874	3,793
Derivative instruments, interest rate swaps	51
Financial liabilities:
Accrued interest payable	2,699	2,389
Fair Value | Level 3 Inputs
Financial assets:
Loans, net of allowance for loan losses	1,160,060	1,135,861
Loans held for sale	11,468	6,575
Loan servicing rights	12,872	12,194
Financial liabilities:
Other borrowings	841	1,299
Advances from FHLB	107,007	121,793
Subordinated debentures	44,725	15,523
Bank Time Deposits | Carrying Amount | Level 3 Inputs
Financial liabilities:
Deposits	834,102	706,500
Bank Time Deposits | Fair Value | Level 3 Inputs
Financial liabilities:
Deposits	826,471	709,219
Other Deposits | Carrying Amount | Level 1 Inputs
Financial liabilities:
Deposits	376,329	403,577
Other Deposits | Fair Value | Level 1 Inputs
Financial liabilities:
Deposits	$ 362,117	$ 401,503

Other Real Estate Owned - Summa

Other Real Estate Owned - Summary of Changes in Other Real Estate Owned (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Real Estate Owned Disclosure Of Detailed Components [Abstract]
Balance, beginning of period	$ 9,379	$ 6,995	$ 4,962	$ 3,161
Assets foreclosed	1,687		6,104	4,512
Write-down of other real estate owned	(104)	(78)	(104)	(78)
Net gain on sales of other real estate owned	149	27	149	402
Proceeds from sale of other real estate owned	(2,107)	(27)	(2,107)	(1,080)
Balance, end of period	$ 9,004	$ 6,917	$ 9,004	$ 6,917

Other Real Estate Owned - Expen

Other Real Estate Owned - Expenses (Income) Applicable to Other Real Estate Owned Included in Non-Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Real Estate Owned Disclosure Of Detailed Components [Abstract]
Net gain on sales of other real estate owned	$ (149)	$ (27)	$ (149)	$ (402)
Write-down of other real estate owned	104	78	104	78
Operating expenses, net of rental income	108	25	216	69
Total Expenses	$ 63	$ 76	$ 171	$ (255)

Derivative Financial Instrume74

Derivative Financial Instruments - Additional Information (Detail)	Jun. 15, 2018Security	Jun. 30, 2018USD ($)SecuritySwap	Jun. 30, 2018USD ($)Swap	Dec. 31, 2017USD ($)
Interest Rate Swap
Derivative [Line Items]
Number of trust preferred securities | Security	2	2
Number of outstanding interest rate swap | Swap		2	2
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Pre-tax unrealized loss recognized in accumulated other comprehensive income			$ 98,000
Ineffective portion of cash flow hedge			0
Interest rate swaps designated as a cash flow hedge outstanding				$ 0
Cash collateral for derivative instrument		$ 150,000	150,000
Interest Rate Swap One | Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional value		6,000,000	$ 6,000,000
Maturity date			Jun. 15, 2028
Interest Rate Swap Two | Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional value		$ 6,000,000	$ 6,000,000
Maturity date			Jun. 15, 2028

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Millions	Aug. 01, 2018USD ($)
Appleton, Wisconsin | Subsequent Event | ABS 1, LLC
Subsequent Event [Line Items]
Purchase price of land	$ 1.3