Century Bancorp (CNBKA) 10-Q 8 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Trading Symbol	CNBKA
Entity Registrant Name	CENTURY BANCORP INC
Entity Central Index Key	0000812348
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, State or Province	MA
Title of 12(b) Security	Class A Common Stock
Security Exchange Name	NASDAQ
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,652,349
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,915,560

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 64,523	$ 44,420
Federal funds sold and interest-bearing deposits in other banks	218,488	214,273
Total cash and cash equivalents	283,011	258,693
Securities available-for-sale, amortized cost $280,520 and $260,924, respectively	278,019	260,502
Securities held-to-maturity, fair value $2,365,027 and $2,361,304, respectively	2,304,074	2,351,120
Federal Home Loan Bank of Boston, stock at cost	17,241	19,471
Equity securities, amortized cost $1,635 and $1,635, respectively	1,609	1,688
Loans, net:
Total loans, net	2,498,894	2,426,119
Less: allowance for loan losses	30,804	29,585
Net loans	2,468,090	2,396,534
Bank premises and equipment	36,238	33,952
Accrued interest receivable	12,998	13,110
Goodwill	2,714	2,714
Other assets	158,292	154,640
Total assets	5,562,286	5,492,424
Deposits:
Demand deposits	797,570	712,842
Savings and NOW deposits	1,662,414	1,678,250
Money market accounts	1,489,679	1,453,572
Time deposits	612,849	555,447
Total deposits	4,562,512	4,400,111
Securities sold under agreements to repurchase	219,995	266,045
Other borrowed funds	312,120	370,955
Subordinated debentures	36,083	36,083
Due to broker	5,500
Other liabilities	85,389	86,649
Total liabilities	5,221,599	5,159,843
Stockholders' Equity
Preferred Stock – $1.00 par value; 100,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	12,292	12,292
Retained earnings	348,093	338,980
Stockholders' equity before adjustment of accumulated other comprehensive income (loss)	365,953	356,840
Unrealized losses on securities available-for-sale, net of taxes	(1,839)	(308)
Unrealized losses on securities transferred to held-to-maturity, net of taxes	(1,648)	(1,812)
Pension liability, net of taxes	(21,779)	(22,139)
Total accumulated other comprehensive loss, net of taxes	(25,266)	(24,259)
Total stockholders' equity	340,687	332,581
Total liabilities and stockholders' equity	5,562,286	5,492,424
Construction and land development [Member]
Loans, net:
Total loans, net	6,493	8,992
Commercial and industrial [Member]
Loans, net:
Total loans, net	867,599	812,417
Municipal [Member]
Loans, net:
Total loans, net	141,588	120,455
Commercial real estate [Member]
Loans, net:
Total loans, net	761,464	786,102
Residential real estate [Member]
Loans, net:
Total loans, net	393,338	371,897
Consumer and overdrafts [Member]
Loans, net:
Total loans, net	21,039	21,893
Home equity [Member]
Loans, net:
Total loans, net	307,373	304,363
Class A Common Stock [Member]
Stockholders' Equity
Common stock value	3,652	3,651
Total stockholders' equity	3,652	3,651
Class B Common Stock [Member]
Stockholders' Equity
Common stock value	1,916	1,917
Total stockholders' equity	$ 1,916	$ 1,917

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized cost	$ 280,520	$ 260,924
Held-to-maturity securities, fair value	2,365,027	2,361,304
Equity securities, amortized cost	$ 1,635	$ 1,635
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,652,349	3,650,949
Class B Common Stock [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	1,915,560	1,916,960

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income
Loans	$ 22,199	$ 21,309
Securities held-to-maturity	15,293	13,788
Securities available-for-sale	1,693	2,631
Federal funds sold and interest-bearing deposits in other banks	610	1,349
Total interest income	39,795	39,077
Interest expense
Savings and NOW deposits	3,725	5,466
Money market accounts	5,572	5,343
Time deposits	3,172	2,793
Securities sold under agreements to repurchase	626	385
Other borrowed funds and subordinated debentures	1,499	1,652
Total interest expense	14,594	15,639
Net interest income	25,201	23,438
Provision for loan losses	1,075	375
Net interest income after provision for loan losses	24,126	23,063
Other operating income
Service charges on deposit accounts	2,296	2,209
Lockbox fees	930	1,089
Gains on sales of mortgage loans		15
Other income	1,084	1,114
Total other operating income	4,310	4,427
Operating expenses
Salaries and employee benefits	11,371	11,035
Occupancy	1,515	1,701
Equipment	837	783
FDIC Assessments		373
Other	4,450	4,298
Total operating expenses	18,173	18,190
Income before income taxes	10,263	9,300
(Benefit) Provision for income taxes	597	(118)
Net income	$ 9,666	$ 9,418
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,652,349	3,610,329
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909
Basic earnings per share	$ 2.10	$ 2.05
Diluted earnings per share	$ 1.74	$ 1.69
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,915,560	1,957,580
Weighted average number of shares outstanding, diluted	1,915,560	1,957,580
Basic earnings per share	$ 1.05	$ 1.03
Diluted earnings per share	$ 1.05	$ 1.03

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 9,666	$ 9,418
Unrealized gains (losses) on securities:
Unrealized (losses) gains arising during period	(1,531)	(462)
Less: reclassification adjustment for gains included in net income
Total unrealized (losses) gains on securities	(1,531)	(462)
Accretion of net unrealized losses transferred	164	216
Defined benefit pension plans:
Amortization of prior service cost and loss included in net periodic benefit cost	360	263
Other comprehensive (loss) income	(1,007)	17
Comprehensive income	$ 8,659	$ 9,435

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Class A Common Stock [Member]	Retained Earnings [Member]Class B Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2018	$ 300,439	$ 3,608	$ 1,960	$ 12,292	$ 301,488			$ (18,909)
Net income	9,418				9,418
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	(462)							(462)
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	216							216
Pension liability adjustment, net of taxes	263							263
Conversion of Class B Common Stock to Class A Common Stock		2	(2)
Cash dividends		(433)	(117)			$ (433)	$ (117)
Ending balance at Mar. 31, 2019	309,324	3,610	1,958	12,292	310,356			(18,892)
Beginning balance at Dec. 31, 2019	332,581	3,651	1,917	12,292	338,980			(24,259)
Net income	9,666				9,666
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	(1,531)							(1,531)
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	164							164
Pension liability adjustment, net of taxes	360							360
Conversion of Class B Common Stock to Class A Common Stock		1	(1)
Cash dividends		(438)	(115)			$ (438)	$ (115)
Ending balance at Mar. 31, 2020	$ 340,687	$ 3,652	$ 1,916	$ 12,292	$ 348,093			$ (25,266)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019
Unrealized holding (losses) gains arising during period, taxes	$ 548		$ 166
Accretion of net unrealized losses transferred during the period, taxes	58		78
Pension liability adjustment, taxes	$ 141		$ 103
Class A Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	1,400		2,300
Cash dividends, per share	$ 0.12		$ 0.12
Class B Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	1,400	2,300
Cash dividends, per share	$ 0.06		$ 0.06

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 9,666	$ 9,418
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Gain on sales of mortgage loans		(15)
Net loss (gain) on equity securities	79	(53)
Provision for loan losses	1,075	375
Deferred income taxes	(114)	104
Net depreciation and amortization	(578)	(468)
Decrease (increase) in accrued interest receivable	112	(58)
(Increase) decrease in other assets	2,359	2,187
Increase in other liabilities	(336)	(458)
Net cash provided by operating activities	12,263	11,032
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from redemptions of Federal Home Loan Bank of Boston stock	6,831	4,777
Purchase of Federal Home Loan Bank of Boston stock	(4,601)	(1,047)
Proceeds from calls/maturities of securities available-for-sale	20,734	34,927
Purchase of securities available-for-sale	(39,719)	(34,031)
Proceeds from calls/maturities of securities held-to-maturity	123,723	88,027
Purchase of securities held-to-maturity	(70,171)	(148,500)
Net increase in loans	(72,621)	(25,811)
Proceeds from sales of portfolio loans		685
Bank owned life insurance purchases	(6,000)
Capital expenditures	(3,084)	(1,344)
Net cash used in investing activities	(44,908)	(82,317)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in time deposits	57,402	(18,500)
Net increase in demand, savings, money market and NOW deposits	104,999	61,163
Cash dividends	(553)	(550)
Net (decrease) increase in securities sold under agreements to repurchase	(46,050)	10,260
Net (decrease) increase in other borrowed funds	(58,835)	54,770
Net cash provided by financing activities	56,963	107,143
Net increase in cash and cash equivalents	24,318	35,858
Cash and cash equivalents at beginning of period	258,693	342,503
Cash and cash equivalents at end of period	283,011	378,361
Cash paid (received) during the period for:
Interest	14,711	15,462
Income tax refunds	300
Income taxes		(1,265)
Change in unrealized gains (losses) on securities available-for-sale, net of taxes	(1,531)	(462)
Change in unrealized losses on securities transferred to held-to-maturity, net of taxes	164	216
Pension liability adjustment, net of taxes	360	263
Change in due to (from) to broker	$ 5,500	$ 11,740

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Financial Statement Presentation	Note 1. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of Century Bancorp, Inc. (the “Company”) and its wholly owned subsidiary, Century Bank and Trust Company (the “Bank”). The consolidated financial statements also include the accounts of the Bank’s wholly owned subsidiaries, Century Subsidiary Investments, Inc. (“CSII”), Century Subsidiary Investments, Inc. II (“CSII II”), Century Subsidiary Investments, Inc. III (“CSII III”) and Century Financial Services Inc. (“CFSI”). CSII, CSII II, and CSII III are engaged in buying, selling and holding investment securities. CFSI has the power to engage in financial agency, securities brokerage, and investment and financial advisory services and related securities credit. The Company also owns 100% of Century Bancorp Capital Trust II (“CBCT II”). The entity is an unconsolidated subsidiary of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company provides a full range of banking services to individual, business and municipal customers in Massachusetts, New Hampshire, Rhode Island, Connecticut, and New York. As a bank holding company, the Company is subject to the regulation and supervision of the Federal Reserve Board. The Bank, a state chartered financial institution, is subject to supervision and regulation by applicable state and federal banking agencies, including the Federal Reserve Board, the Federal Deposit Insurance Corporation (the “FDIC”) and the Commonwealth of Massachusetts Commissioner of Banks. The Bank is also subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy. All aspects of the Company’s business are highly competitive. The Company faces aggressive competition from other lending institutions and from numerous other providers of financial services. The Company has one reportable operating segment. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general practices within the banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ from those estimates. The Company’s quarterly report on Form 10-Q 10-K 2016-13, 2016-13. Material estimates that are susceptible to change in the near term relate to the allowance for loan losses. Management believes that the allowance for loan losses is adequate based on a review of factors, including historical charge-off COVID-19

Securities Available-for-Sale

Securities Available-for-Sale	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Securities Available-for-Sale	Note 2. Securities Available-for-Sale March 31, 2020 December 31, 2019 Gross Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value (in thousands) SBA Backed Securities $ 50,722 $ 25 $ 132 $ 50,615 $ 54,331 $ 23 $ 143 $ 54,211 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 208,596 157 2,538 206,215 184,580 139 532 184,187 Privately Issued Residential Mortgage-Backed Securities 378 — 44 334 397 1 2 396 Obligations Issued by States and Political Subdivisions 17,224 — — 17,224 18,016 60 — 18,076 Other Debt Securities 3,600 42 11 3,631 3,600 51 19 3,632 Total $ 280,520 $ 224 $ 2,725 $ 278,019 $ 260,924 $ 274 $ 696 $ 260,502 Included in SBA Backed Securities, and U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities are securities at fair value pledged to secure public deposits and repurchase agreements amounting to $185,943,000 and $186,245,000 at March 31, 2020 and December 31, 2019, respectively. Also included in securities available-for-sale available-for-sale available-for-sale Debt securities of U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac. The following table shows the maturity distribution of the Company’s securities available-for-sale Amortized Fair Cost Value (in thousands) Within one year $ 18,618 $ 18,568 After one but within five years 149,846 148,675 After five but within ten years 107,266 105,995 More than 10 years 4,790 4,781 Total $ 280,520 $ 278,019 The weighted average remaining life of investment securities available-for-sale As of March 31, 2020 and December 31, 2019, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of its remaining amortized cost. In making its other-than-temporary impairment evaluation, the Company considered that the principal and interest on these securities are from issuers that are investment grade. The unrealized loss on SBA Backed Securities, U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company has the ability and intent to hold these investments until recovery of fair value, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2020 or December 31, 2019. In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. In the case of privately issued mortgage-backed securities, the performance of the underlying loans is analyzed as deemed necessary to determine the estimated future cash flows of the securities. Factors considered include the level of subordination, current and estimated future default rates, current and estimated prepayment rates, estimated loss severity rates, geographic concentrations and origination dates of underlying loans. The following table shows the temporarily impaired securities of the Company’s available-for-sale securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 124 holdings at March 31, 2020. March 31, 2020 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 12,806 $ 25 $ 20,687 $ 107 $ 33,493 $ 132 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 131,960 1,846 43,274 692 175,234 2,538 Privately Issued Residential Mortgage-Backed Securities 334 44 — — 334 44 Obligations Issued by States and Political Subdivisions — — Other Debt Securities 800 — 489 11 1,289 11 Total temporarily impaired securities $ 145,900 $ 1,915 $ 64,450 $ 810 $ 210,350 $ 2,725 The following table shows the temporarily impaired securities of the Company’s available-for-sale December 31, 2019 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 14,560 $ 30 $ 22,092 $ 113 $ 36,652 $ 143 U.S. Government Agency and Sponsored Enterprise Mortgage- Backed Securities 108,806 379 29,178 153 137,984 532 Privately Issued Residential Mortgage-Backed Securities 252 2 — — 252 2 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities 800 1 481 18 1,281 19 Total temporarily impaired securities $ 124,418 $ 412 $ 51,751 $ 284 $ 176,169 $ 696

Investment Securities Held-to-M

Investment Securities Held-to-Maturity	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Investment Securities Held-to-Maturity	Note 3. Investment Securities Held-to-Maturity March 31, 2020 December 31, 2019 Gross Gross Gross Gross Amortized Unrealized Unrealized Estimated Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Cost Gains Losses Fair Value (in thousands) U.S. Government Sponsored Enterprises $ 89,419 $ 1,113 $ — $ 90,532 $ 98,867 $ 527 $ 96 $ 99,298 SBA Backed Securities 42,856 492 69 43,279 44,379 182 303 44,258 U.S. Government Sponsored Enterprises Mortgage-Backed Securities 2,171,799 61,037 1,620 2,231,216 2,207,874 20,720 10,846 2,217,748 Total $ 2,304,074 $ 62,642 $ 1,689 $ 2,365,027 $ 2,351,120 $ 21,429 $ 11,245 $ 2,361,304 Included in total investment securities held-to-maturity available-for-sale held-to-maturity At March 31, 2020 and December 31, 2019, all mortgage-backed securities are obligations of U.S. Government Sponsored Enterprises. Debt securities of U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprises Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac. The following table shows the maturity distribution of the Company’s securities held-to-maturity Amortized Fair Cost Value (in thousands) Within one year $ 90,437 $ 91,896 After one but within five years 1,921,419 1,971,224 After five but within ten years 280,016 289,074 More than ten years 12,202 12,833 Total $ 2,304,074 $ 2,365,027 The weighted average remaining life of investment securities held-to-maturity As of March 31, 2020 and December 31, 2019, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of their remaining amortized costs. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade. The unrealized loss on U.S. Government Sponsored Enterprises, SBA Backed Securities, and U.S. Government Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company does not intend to sell any of these securities and it is not more likely than not that it will be required to sell these securities before the anticipated recovery of the remaining amortized cost, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2020 or December 31, 2019. In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. The following table shows the temporarily impaired securities of the Company’s held-to-maturity March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 12,725 $ 69 $ — $ — $ 12,725 $ 69 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 197,134 911 53,703 709 250,837 1,620 Total temporarily impaired securities $ 209,859 $ 980 $ 53,703 $ 709 $ 263,562 $ 1,689 The following table shows the temporarily impaired securities of the Company’s held-to-maturity December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government Sponsored Enterprises 24,420 72 9,976 24 34,396 96 SBA Backed Securities 25,251 303 — — 25,251 303 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 613,905 3,949 389,919 6,897 1,003,824 10,846 Total temporarily impaired securities $ 663,576 $ 4,324 $ 399,895 $ 6,921 $ 1,063,471 $ 11,245

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Allowance for Loan Losses	Note 4. Allowance for Loan Losses The Company maintains an allowance for loan losses in an amount determined by management on the basis of the character of the loans, loan performance, financial condition of borrowers, the value of collateral securing loans and other relevant factors. The following table summarizes the changes in the Company’s allowance for loan losses for the periods indicated. Three months ended March 31, 2020 2019 (in thousands) Allowance for loan losses, beginning of period $ 29,585 $ 28,543 Loans charged off (62 ) (142 ) Recoveries on loans previously charged-off 206 72 Net recoveries (charge-offs) 144 (70 ) Provision charged to expense 1,075 375 Allowance for loan losses, end of period $ 30,804 $ 28,848 Further information pertaining to the allowance for loan losses for the three months ending March 31, 2020 is as follows: Construction Commercial and Land and Commercial Residential Home Development Industrial Municipal Real Estate Real Estate Consumer Equity Unallocated Total (in thousands) Allowance for loan losses: Balance at December 31, 2019 $ 331 $ 11,596 $ 2,566 $ 11,464 $ 2,194 $ 312 $ 1,065 $ 57 $ 29,585 Charge-offs — (5 ) — — — (57 ) — — (62 ) Recoveries — 164 — — — 37 5 — 206 Provision (85 ) 673 323 (343 ) 255 4 67 181 1,075 Ending balance at March 31, 2020 $ 246 $ 12,428 $ 2,889 $ 11,121 $ 2,449 $ 296 $ 1,137 $ 238 $ 30,804 Amount of allowance for loan losses for loans deemed to be impaired $ — $ — $ — $ 85 $ — $ — $ — $ — $ 85 Amount of allowance for loan losses for loans not deemed to be impaired $ 246 $ 12,428 $ 2,889 $ 11,036 $ 2,449 $ 296 $ 1,137 $ 238 $ 30,719 Loans: Ending balance $ 6,493 $ 867,599 $ 141,588 $ 761,464 $ 393,338 $ 21,039 $ 307,373 $ — $ 2,498,894 Loans deemed to be impaired $ — $ 623 $ — $ 2,322 $ — $ — $ — $ — $ 2,945 Loans not deemed to be impaired $ 6,493 $ 866,976 $ 141,588 $ 759,142 $ 393,338 $ 21,039 $ 307,373 $ — $ 2,495,949 Further information pertaining to the allowance for loan losses for the three months ending March 31, 2019 is as follows: Construction Commercial and Land and Commercial Residential Home Development Industrial Municipal Real Estate Real Estate Consumer Equity Unallocated Total (in thousands) Allowance for loan losses: Balance at December 31, 2018 $ 1,092 $ 10,998 $ 1,838 $ 10,663 $ 2,190 $ 365 $ 1,111 $ 286 $ 28,543 Charge-offs — (43 ) — — — (99 ) — — (142 ) Recoveries — 18 — — — 54 — — 72 Provision (81 ) 183 160 104 (55 ) 22 (10 ) 52 375 Ending balance at March 31, 2019 $ 1,011 $ 11,156 $ 1,998 $ 10,767 $ 2,135 $ 342 $ 1,101 $ 338 $ 28,848 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 6 $ — $ 94 $ — $ — $ — $ — $ 100 Amount of allowance for loan losses for loans not deemed to be impaired $ 1,011 $ 11,150 $ 1,998 $ 10,673 $ 2,135 $ 342 $ 1,101 $ 338 $ 28,748 Loans: Ending balance $ 13,305 $ 767,436 $ 105,288 $ 746,703 $ 349,966 $ 22,123 $ 305,839 $ — $ 2,310,660 Loans deemed to be impaired $ — $ 320 $ — $ 2,946 $ — $ — $ — $ — $ 3,266 Loans not deemed to be impaired $ 13,305 $ 767,116 $ 105,288 $ 743,757 $ 349,966 $ 22,123 $ 305,839 $ — $ 2,307,394 The Company utilizes a six grade internal loan rating system for commercial real estate, construction and commercial loans as follows: Loans rated 1-3 Loans in this category are considered “pass” rated loans with low to average risk. Loans rated 4 (Monitor): These loans represent classified loans that management is closely monitoring for credit quality. These loans have had or may have minor credit quality deterioration as of March 31, 2020 and December 31, 2019. Loans rated 5 (Substandard): Substandard loans represent classified loans that management is closely monitoring for credit quality. These loans have had more significant credit quality deterioration as of March 31, 2020 and December 31, 2019. Loans rated 6 (Doubtful): Doubtful loans represent classified loans that management is closely monitoring for credit quality. These loans had more significant credit quality deterioration as of March 31, 2020 and December 31, 2019 and full collectability is doubtful. Impaired: Impaired loans represent classified loans that management is closely monitoring for credit quality. A loan is classified as impaired when it is probable that the Company will be unable to collect all amounts due. The following table presents the Company’s loans by risk rating at March 31, 2020. Construction Commercial and Land and Commercial Development Industrial Municipal Real Estate (in thousands) Grade: 1-3 $ 6,493 $ 863,026 $ 141,588 $ 734,992 4 (Monitor) — 3,950 — 24,150 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 623 — 2,322 Total $ 6,493 $ 867,599 $ 141,588 $ 761,464 The following table presents the Company’s loans by risk rating at December 31, 2019. Construction Commercial and Land and Commercial Development Industrial Municipal Real Estate (in thousands) Grade: 1-3 $ 8,992 $ 807,486 $ 120,455 $ 759,402 4 (Monitor) — 4,025 — 24,354 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 906 — 2,346 Total $ 8,992 $ 812,417 $ 120,455 $ 786,102 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at March 31, 2020 and are included within the total loan portfolio. Commercial Commercial and Real Industrial Municipal Estate Total (in thousands) Credit Rating: Aaa – Aa3 $ 568,173 $ 74,406 $ 38,955 $ 681,534 A1 – A3 185,819 7,354 147,953 341,126 Baa1 – Baa3 — 51,133 143,302 194,435 Ba2 — 5,895 — 5,895 Total $ 753,992 $ 138,788 $ 330,210 $ 1,222,990 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2019. Commercial Commercial and Real Industrial Municipal Estate Total (in thousands) Credit Rating: Aaa – Aa3 $ 523,644 $ 53,273 $ 40,437 $ 617,354 A1 – A3 186,044 7,354 148,346 341,744 Baa1 – Baa3 — 51,133 144,711 195,844 Ba2 — 5,895 — 5,895 Total $ 709,688 $ 117,655 $ 333,494 $ 1,160,837 The Company utilized payment performance as credit quality indicators for the loan types listed below. The indicators are depicted in the table “aging of past due loans,” below. Further information pertaining to the allowance for loan losses at March 31, 2020 follows: Accruing Accruing Greater Total 30-89 Days Non than Past Current Past Due Accrual 90 Days Due Loans Total (in thousands) Construction and land development $ — $ — $ — $ — $ 6,493 $ 6,493 Commercial and industrial 337 374 — 711 866,888 867,599 Municipal — — — — 141,588 141,588 Commercial real estate 2,322 238 — 2,560 758,904 761,464 Residential real estate 2,455 890 — 3,345 389,993 393,338 Consumer and overdrafts 17 6 — 23 21,016 21,039 Home equity 1,450 193 — 1,643 305,730 307,373 Total $ 6,581 $ 1,701 $ — $ 8,282 $ 2,490,612 $ 2,498,894 Further information pertaining to the allowance for loan losses at December 31, 2019 follows: Accruing Accruing Greater Total 30-89 Days Non than Past Current Past Due Accrual 90 Days Due Loans Total (in thousands) Construction and land development $ — $ — $ — $ — $ 8,992 $ 8,992 Commercial and industrial 227 400 — 627 811,790 812,417 Municipal — — — — 120,455 120,455 Commercial real estate 840 492 — 1,332 784,770 786,102 Residential real estate 1,563 683 — 2,246 369,651 371,897 Consumer and overdrafts 18 4 — 22 21,871 21,893 Home equity 603 435 — 1,038 303,325 304,363 Total $ 3,251 $ 2,014 $ — $ 5,265 $ 2,420,854 $ 2,426,119 Impaired loans A loan is impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company measures impairment based on a loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. Loans are charged-off charged-off The following is information pertaining to impaired loans for March 31, 2020: Average Interest Carrying Income Value Recognized for 3 for 3 Unpaid Months Months Carrying Principal Required Ending Ending Value Balance Reserve 3/31/20 3/31/20 (in thousands) With no required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 623 641 — 582 1 Municipal — — — — — Commercial real estate 155 185 — 157 — Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 778 $ 826 $ — $ 739 $ 1 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial — — — 113 1 Municipal — — — — — Commercial real estate 2,167 2,290 85 2,176 22 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,167 $ 2,290 $ 85 $ 2,289 $ 23 Total: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 623 641 — 695 2 Municipal — — — — — Commercial real estate 2,322 2,475 85 2,333 22 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,945 $ 3,116 $ 85 $ 3,028 $ 24 The following is information pertaining to impaired loans for March 31, 2019: Average Interest Carrying Income Value Recognized Unpaid for 3 Months for 3 Months Carrying Principal Required Ending Ending Value Balance Reserve 3/31/19 3/31/19 (in thousands) With no required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 93 306 — 87 2 Municipal — — — — — Commercial real estate 182 206 — 188 — Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 275 $ 512 $ — $ 275 $ 2 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 227 228 6 262 3 Municipal — — — — — Commercial real estate 2,764 2,881 94 2,694 24 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,991 $ 3,109 $ 100 $ 2,956 $ 27 Total: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 320 534 6 349 5 Municipal — — — — — Commercial real estate 2,946 3,087 94 2,882 24 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 3,266 $ 3,621 $ 100 $ 3,231 $ 29 Troubled debt restructurings (“TDR”) are identified as modifications in which a concession was granted to a customer who was having financial difficulties. This concession may be below market rate, longer amortization/term, or a lower payment amount. The present value calculation of the modification did not result in an increase in the allowance for these loans beyond any previously established allocations. There was no TDR that occurred during the three-month period ended March 31, 2020. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during the first three months of 2020. Under Section 4013 of the CARES Act, loans less than 30 days past due as of December 31, 2019 will be considered current for COVID-19 COVID-19 COVID-19 As of March 31, 2020, and as a result of COVID-19 loan modification, the Company had modified 58 loans aggregating $32,073,000, primarily consisting of the deferral of principal and/or the extension of the maturity date. Of these modifications, $32,073,000, or 100%, were performing in accordance with their modified terms. There was no troubled debt restructuring that occurred during the three-month period ended March 31, 2019. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during the first three months of 2019.

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income	Note 5. Reclassifications Out of Accumulated Other Comprehensive Income Amount Reclassified from Accumulated Other Comprehensive Income Three Three Affected Line Item in the Details about Accumulated Other Months Ended Months Ended Statement where Net Income is Comprehensive Income Components March 31, 2020 March 31, 2019 Presented (in thousands) Accretion of unrealized losses transferred $ (222 ) $ (294 ) Securities held-to-maturity Tax (expense) or benefit 58 78 Provision for income taxes Net of tax $ (164 ) $ (216 ) Net income Amortization of defined benefit pension items Prior-service costs $ (29 ) $ (29 )(b) Salaries and employee benefits Actuarial gains (losses) (472 ) (337 )(b) Salaries and employee benefits Total before tax (501 ) (366 ) Income before taxes Tax (expense) or benefit 141 103 Provision for income taxes Net of tax $ (360 ) $ (263 ) Net income (a) Amount in parentheses indicates reductions to net income. (b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Employee Benefits footnote (Note 7) for additional details).

Earnings per share ("EPS")

Earnings per share ("EPS")	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings per share ("EPS")	Note 6. Earnings per Share (“EPS”) Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock. Diluted EPS includes the dilutive effect of common stock equivalents and assumes the conversion of all Class B common stock; basic EPS excludes all common stock equivalents. The Company had no common stock equivalents outstanding for the periods ended March 31, 2020 and 2019. The following table is a reconciliation of basic EPS and diluted EPS. Three Months Ended March 31, (in thousands except share and per share data) 2020 2019 Basic EPS Computation: Numerator: Net income, Class A $ 7,658 $ 7,409 Net income, Class B 2,008 2,009 Denominator: Weighted average shares outstanding, Class A 3,652,349 3,610,329 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Basic EPS, Class A $ 2.10 $ 2.05 Basic EPS, Class B 1.05 1.03 Diluted EPS Computation: Numerator: Net income, Class A $ 7,658 $ 7,409 Net income, Class B 2,008 2,009 Total net income, for diluted EPS, Class A computation 9,666 9,418 Denominator: Weighted average shares outstanding, basic, Class A 3,652,349 3,610,329 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Weighted average shares outstanding diluted, Class A 5,567,909 5,567,909 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Diluted EPS, Class A $ 1.74 $ 1.69 Diluted EPS, Class B 1.05 1.03

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Employee Benefits	Note 7. Employee Benefits The Company provides pension benefits to its employees under a noncontributory, defined benefit plan which is funded on a current basis in compliance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”) and recognizes costs over the estimated employee service period. The Company also has a Supplemental Executive Insurance/Retirement Plan (the “Supplemental Plan”) which is limited to certain officers and employees of the Company. The Supplemental Plan is accrued on a current basis and recognizes costs over the estimated employee service period. Executive officers of the Company and its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary, and participants are required to contribute to its cost. Life insurance policies, which are owned by the Company, are purchased covering the lives of each participant. Components of Net Periodic Benefit Cost for the Three Months Ended March 31, Supplemental Insurance/ Pension Benefits Retirement Plan 2020 2019 2020 2019 (in thousands) Service cost $ 344 $ 276 $ 353 $ 256 Interest 450 473 466 482 Expected return on plan assets (952 ) (819 ) — — Recognized prior service cost (benefit) — — 29 28 Recognized net actuarial losses 261 229 211 109 Net periodic benefit (credit) cost $ 103 $ 159 $ 1,059 $ 875 Approximately $465,000 and $502,000 of costs other than service costs, from the table above, are included in other expenses for the three months ended March 31, 2020 and 2019, respectively. The Company does not intend to contribute to the Defined Benefit Pension Plan in 2020.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 8. Fair Value Measurements The Company follows FASB ASC 820-10, 2016-1, (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities 820-10 Level I – Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices such as G-7 Level II – Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments include cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments which are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds, and OTC derivatives. Level III – Instruments that have little to no pricing observability as of the reported date. These financial instruments do not have two-way The results of the fair value hierarchy as of March 31, 2020, are as follows: Financial Instruments Measured at Fair Value on a Recurring Basis: Securities AFS Fair Value Measurements Using Quoted Prices In Active Significant Markets for Significant Other Identical Observable Unobservable Carrying Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (in thousands) SBA Backed Securities $ 50,615 $ — $ 50,615 $ — U.S. Government Agency and Sponsored Mortgage-Backed Securities 206,215 — 206,215 — Privately Issued Residential Mortgage- Backed Securities 334 — 334 — Obligations Issued by States and Political Subdivisions 17,224 — — 17,224 Other Debt Securities 3,631 — 3,631 — Total Debt Securities $ 278,019 $ — $ 260,795 $ 17,224 Equity Securities $ 1,609 $ 243 $ 1,366 $ — Financial Instruments Measured at Fair Value on a Non-recurring Impaired Loans $ 608 $ — $ — $ 608 Impaired loan balances represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not observable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category. Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. All impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis, appraisal of collateral or other type of real estate tax assessment. The types of adjustments that are made to specific provisions related to impaired loans recognized for the three-month period ended March 31, 2020 amounted to ($9,000). The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Unobservable Input Asset Fair Value Valuation Technique Unobservable Input Value or Range Securities AFS $ 17,224 Discounted cash flow Discount rate 0%-1% (3) Impaired Loans $ 608 Appraisal of collateral (1) Appraisal adjustments (2) 0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages. The changes in Level 3 securities for the three-month period ended March 31, 2020 are shown in the table below: Obligations Issued by States & Political Subdivisions Balance at December 31, 2019 $ 13,301 Purchases 9,372 Maturities and calls (5,449 ) Amortization — Balance at March 31, 2020 $ 17,224 The amortized cost of Level 3 securities was $17,224,000 at March 31, 2020 with an unrealized loss of $0. The securities in this category are generally municipal securities with no readily determinable fair value. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity. The fair value of impaired loans decreased by $269,000, for the first three months of 2020, mainly attributable to one loan that was paid down. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the three-month period ended March 31, 2020. The changes in Level 3 securities for the three-month period ended March 31, 2019, are shown in the table below: Obligations Issued by States & Political Subdivisions Balance at December 31, 2018 $ 88,728 Purchases 970 Maturities and calls (26,352 ) Amortization (14 ) Changes in fair value — Balance at March 31, 2019 $ 63,332 The amortized cost of Level 3 securities was $63,332,000 at March 31, 2019 with an unrealized loss of $0. The securities in this category are generally municipal securities with no readily determinable fair value. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity. There was no change in the fair value of other real estate owned for the first three months of 2019. The fair value of impaired loans decreased by $56,000, for the first three months of 2019, mainly as a result of a charge-off The results of the fair value hierarchy as of December 31, 2019, are as follows: Financial Instruments Measured at Fair Value on a Recurring Basis: Securities AFS Fair Value Measurements Using Quoted Prices In Active Significant Markets for Significant Other Identical Observable Unobservable Carrying Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (in thousands) SBA Backed Securities $ 54,211 $ — $ 54,211 $ — U.S. Government Agency and Sponsored Mortgage-Backed Securities 184,187 — 184,187 — Privately Issued Residential Mortgage-Backed Securities 396 — 396 — Obligations Issued by States and Political Subdivisions 18,076 — 4,775 13,301 Other Debt Securities 3,632 3,632 — Total $ 260,502 $ — $ 247,201 $ 13,301 Financial Instruments Measured at Fair Value on a Recurring Basis Equity Securities $ 1,688 $ 343 $ 1,345 $ — Financial Instruments Measured at Fair Value on a Non-recurring $ 877 $ — $ — $ 877 Impaired loan balances in the table above represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category. Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions relate to impaired loans recognized for 2019 for the estimated credit loss amounted to $79,000. There were no transfers between level 1, 2 and 3 for the year ended December 31, 2019. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2019. The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Unobservable Input Asset Fair Value Valuation Technique Unobservable Input Value or Range Securities AFS $ 13,301 Discounted cash flow Discount rate 1.5%-3.2% (3) Impaired Loans $ 877 Appraisal of collateral (1) Appraisal adjustments (2) 0%-30% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages.

Fair Values of Financial Instru

Fair Values of Financial Instruments	3 Months Ended
	Mar. 31, 2020
Investments, All Other Investments [Abstract]
Fair Values of Financial Instruments	Note 9. Fair Values of Financial Instruments The following methods and assumptions were used by the Company in estimating fair values of its financial instruments. Excluded from this disclosure are all non-financial The assumptions used below are expected to approximate those that market participants would use in valuing these financial instruments. Fair value estimates are made at a specific point in time, based on available market information and judgments about the financial instrument, including estimates of timing, amount of expected future cash flows and the credit standing of the issuer. Such estimates do not consider the tax impact of the realization of unrealized gains or losses. In some cases, the fair value estimates cannot be substantiated by comparison to independent markets. In addition, the disclosed fair value may not be realized in the immediate settlement of the financial instrument. Care should be exercised in deriving conclusions about our business, its value or financial position based on the fair value information of financial instruments presented below. Securities Held-to-Maturity The fair values of these securities were based on quoted market prices, where available, as provided by third-party investment portfolio pricing vendors. If quoted market prices were not available, fair values provided by the vendors were based on quoted market prices of comparable instruments in active markets and/or based on a matrix pricing methodology which employs The Bond Market Association’s standard calculations for cash flow and price/yield analysis, live benchmark bond pricing and terms/condition data available from major pricing sources. Management regards the inputs and methods used by third party pricing vendors to be “Level 2 inputs and methods” as defined in the “fair value hierarchy” provided by FASB. Loans The fair value of loans is estimated using the exit price notion consistent with Topic 820, Fair Value Measurement. Fair value is determined based on a discounted cash flow analysis. The discounted cash flow analysis was based on the contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk. For certain non-performing Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Other Borrowed Funds The fair value of other borrowed funds is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other borrowed funds of similar remaining maturities. Subordinated Debentures The fair value of subordinated debentures is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other subordinated debentures of similar remaining maturities. The following presents (in thousands) the carrying amount, estimated fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of March 31, 2020 and December 31, 2019. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, short-term investments, FHLBB stock and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include non-maturity Fair Value Carrying Estimated Measurements Level 2 Level 3 March 31, 2020 Amount Fair Value Level 1 Inputs Inputs Inputs (in thousands) Financial assets: Securities held-to-maturity $ 2,304,074 $ 2,365,027 $ — $ 2,365,027 $ — Loans (1) 2,468,090 2,437,099 — — 2,437,099 Financial liabilities: Time deposits 612,849 621,553 — 621,553 — Other borrowed funds 312,120 320,830 — 320,830 — Subordinated debentures 36,083 36,083 — 36,083 — December 31, 2019 Financial assets: Securities held-to-maturity $ 2,351,120 $ 2,361,304 $ — $ 2,361,304 $ — Loans (1) 2,396,534 2,424,770 — — 2,424,770 Financial liabilities: Time deposits 555,447 560,746 — 560,746 — Other borrowed funds 370,955 374,531 — 374,531 — Subordinated debentures 36,083 36,083 — 36,083 — (1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the type of financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Bank’s entire holdings of a particular financial instrument. Because no active market exists for some of the Bank’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, cash flows, current economic conditions, risk characteristics and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions and changes in the loan, debt and interest rate markets could significantly affect the estimates. Further, the income tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 10. Revenue from Contracts with Customers Revenue from contracts with customers in the scope of ASC Topic 606 is measured based on the consideration specified in the contract with a customer, and excludes amounts collected on behalf of third parties. The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered, and our contracts do not include multiple performance obligations. Payment is generally collected at the time services are rendered, or monthly. Unsatisfied performance obligations at the report date are not material to our consolidated financial statements. The Company pays sales commissions to its employees in accordance with certain incentive plans. The Company expenses sales commissions when incurred if we do not expect to recover these costs from the terms of the contract with the customer. Sales commissions are included in compensation expense. In certain cases, other parties are involved with providing products and services to our customers. If the Company is a principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue. Waivers and reversals are recorded as a reduction of revenue either when the revenue is recognized by the Company or at the time the waiver or reversal is earned by the customer. A. Nature of goods and services The vast majority of the Company’s revenue is specifically out-of-scope in-scope, a. Revenue earned at a point in time – Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, NSF fees, credit and debit card interchange fees and foreign exchange transaction fees. Revenue is generally derived from transactional information accumulated by our systems and is recognized as revenue immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of credit and debit card interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal. b. Revenue earned over time – The Company earns revenue from contracts with customers in a variety of ways in which the revenue is earned over a period of time – generally monthly or quarterly. Examples of this type of revenue are deposit account service fees, lockbox fees, investment management fees, merchant referral services, and safe deposit box fees. Account service charges, management fees and referral fees are recognized on a monthly basis while any transaction based income is recorded as the activity occurs. Revenue is primarily based on the number and type of transactions or assets managed and is generally derived from transactional information accumulated by our systems. Revenue is recorded in the same period as the related transactions occur or services are rendered to the customer. B. Disaggregation of revenue The following table presents total revenues as presented in the Consolidated Statements of Income and the related amounts which are from contracts with customers within the scope of Topic 606. As illustrated here, the vast majority of our revenues are specifically excluded from the scope of Topic 606. Three Revenue from Three Revenue from Months Contracts in Months Contracts in Ended Scope of Ended Scope of 3/31/2020 Topic 606 3/31/2019 Topic 606 (dollars in thousands) Total interest income $ 25,201 $ — $ 23,438 $ — Noninterest income: Service charges on deposit accounts 2,296 2,296 2,209 2,209 Lockbox fees 930 930 1,089 1,089 Gains on sales of mortgage loans — — 15 — Other income 1,084 599 1,114 800 Total noninterest income 4,310 3,825 4,427 4,098 Total revenues $ 29,511 $ 3,825 $ 27,865 $ 4,098 The following table provides information about receivables with customers. March 31, 2020 December 31, 2019 (dollars in thousands) Receivables, which are included in “Other assets” $ 1,236 $ 1,200

Leases

Leases	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Leases	Note 11. Leases The Company has operating leases primarily for branch locations as well as data processing centers. The Company’s operating leases have remaining lease terms of 1 year to 32 years, some of which include options to extend the leases for up to 10 years, and some of which include options to terminate the leases within 1 year. The Company also has one sublease for part of a data processing center that the Company currently leases from a lessor. The sublease expires in 2022 with an option to terminate and no option to extend. Lease income, for the sublease, totaled approximately $9,900 for the three months ended March 31, 2020. Variable lease costs include costs that are not included in the lease liability. The components of lease expense were as follows: Three Three Months Months Ended Ended 3/31/2020 3/31/2019 (in thousands) Operating lease cost $ 546 $ 563 Variable lease cost 133 148 Total lease cost $ 679 $ 711 Supplemental cash flow information related to leases was as follows: Three Three Months Months Ended Ended 3/31/2020 3/31/2019 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 529 $ 538 Right-of-use Operating leases $ 421 $ 443 Supplemental balance sheet information related to leases was as follows: 3/31/2020 12/31/2019 (in thousands, except lease term and discount rate) Operating Leases: Operating lease right-of-use $ 12,085 $ 12,521 Operating lease liabilities $ 12,267 $ 12,690 Weighted Average Remaining Lease Term: Operating Leases 11 years 11 years Weighted Average Discount Rate: Operating Leases 3.5 % 3.5 % A summary of future minimum rental payments under such leases as the dates indicated follows: Minimum Rental Payments March 31, 2020 December 31, 2019 (in thousands) Year Ending December 31, 2020 $ 1,502 $ 2,030 2021 1,754 1,754 2022 1,603 1,603 2023 1,545 1,545 2024 1,277 1,277 Thereafter 7,311 7,312 Total lease payments $ 14,992 $ 15,521 Less imputed interest (2,725 ) (2,831 ) Present value of lease liability $ 12,267 $ 12,690 March 31, 2020 minimum rental payments represent nine months o f

Securities Available-for-Sale (

Securities Available-for-Sale (Tables)	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Summary of Securities Available-for-Sale	March 31, 2020 December 31, 2019 Gross Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value (in thousands) SBA Backed Securities $ 50,722 $ 25 $ 132 $ 50,615 $ 54,331 $ 23 $ 143 $ 54,211 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 208,596 157 2,538 206,215 184,580 139 532 184,187 Privately Issued Residential Mortgage-Backed Securities 378 — 44 334 397 1 2 396 Obligations Issued by States and Political Subdivisions 17,224 — — 17,224 18,016 60 — 18,076 Other Debt Securities 3,600 42 11 3,631 3,600 51 19 3,632 Total $ 280,520 $ 224 $ 2,725 $ 278,019 $ 260,924 $ 274 $ 696 $ 260,502
Estimated Maturity Distribution of Securities Available-for-Sale	The following table shows the maturity distribution of the Company’s securities available-for-sale Amortized Fair Cost Value (in thousands) Within one year $ 18,618 $ 18,568 After one but within five years 149,846 148,675 After five but within ten years 107,266 105,995 More than 10 years 4,790 4,781 Total $ 280,520 $ 278,019
Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer	The following table shows the temporarily impaired securities of the Company’s available-for-sale securities that are temporarily impaired for less than 12 months and for 12 months or longer, respectively, out of a total of 124 holdings at March 31, 2020. March 31, 2020 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 12,806 $ 25 $ 20,687 $ 107 $ 33,493 $ 132 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 131,960 1,846 43,274 692 175,234 2,538 Privately Issued Residential Mortgage-Backed Securities 334 44 — — 334 44 Obligations Issued by States and Political Subdivisions — — Other Debt Securities 800 — 489 11 1,289 11 Total temporarily impaired securities $ 145,900 $ 1,915 $ 64,450 $ 810 $ 210,350 $ 2,725 The following table shows the temporarily impaired securities of the Company’s available-for-sale December 31, 2019 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 14,560 $ 30 $ 22,092 $ 113 $ 36,652 $ 143 U.S. Government Agency and Sponsored Enterprise Mortgage- Backed Securities 108,806 379 29,178 153 137,984 532 Privately Issued Residential Mortgage-Backed Securities 252 2 — — 252 2 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities 800 1 481 18 1,281 19 Total temporarily impaired securities $ 124,418 $ 412 $ 51,751 $ 284 $ 176,169 $ 696

Investment Securities Held-to_2

Investment Securities Held-to-Maturity (Tables)	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Summary of Held-to-Maturity Securities	March 31, 2020 December 31, 2019 Gross Gross Gross Gross Amortized Unrealized Unrealized Estimated Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Cost Gains Losses Fair Value (in thousands) U.S. Government Sponsored Enterprises $ 89,419 $ 1,113 $ — $ 90,532 $ 98,867 $ 527 $ 96 $ 99,298 SBA Backed Securities 42,856 492 69 43,279 44,379 182 303 44,258 U.S. Government Sponsored Enterprises Mortgage-Backed Securities 2,171,799 61,037 1,620 2,231,216 2,207,874 20,720 10,846 2,217,748 Total $ 2,304,074 $ 62,642 $ 1,689 $ 2,365,027 $ 2,351,120 $ 21,429 $ 11,245 $ 2,361,304
Company's Securities Held-to-Maturity	The following table shows the maturity distribution of the Company’s securities held-to-maturity Amortized Fair Cost Value (in thousands) Within one year $ 90,437 $ 91,896 After one but within five years 1,921,419 1,971,224 After five but within ten years 280,016 289,074 More than ten years 12,202 12,833 Total $ 2,304,074 $ 2,365,027
Unrealized Market Loss of Securities	The following table shows the temporarily impaired securities of the Company’s held-to-maturity March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) SBA Backed Securities $ 12,725 $ 69 $ — $ — $ 12,725 $ 69 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 197,134 911 53,703 709 250,837 1,620 Total temporarily impaired securities $ 209,859 $ 980 $ 53,703 $ 709 $ 263,562 $ 1,689 The following table shows the temporarily impaired securities of the Company’s held-to-maturity December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized Temporarily Impaired Investments Value Losses Value Losses Value Losses (in thousands) U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government Sponsored Enterprises 24,420 72 9,976 24 34,396 96 SBA Backed Securities 25,251 303 — — 25,251 303 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 613,905 3,949 389,919 6,897 1,003,824 10,846 Total temporarily impaired securities $ 663,576 $ 4,324 $ 399,895 $ 6,921 $ 1,063,471 $ 11,245

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Analysis of the allowance for loan losses	The following table summarizes the changes in the Company’s allowance for loan losses for the periods indicated. Three months ended March 31, 2020 2019 (in thousands) Allowance for loan losses, beginning of period $ 29,585 $ 28,543 Loans charged off (62 ) (142 ) Recoveries on loans previously charged-off 206 72 Net recoveries (charge-offs) 144 (70 ) Provision charged to expense 1,075 375 Allowance for loan losses, end of period $ 30,804 $ 28,848
Summary of Allowance for Loan Losses	Further information pertaining to the allowance for loan losses for the three months ending March 31, 2020 is as follows: Construction Commercial and Land and Commercial Residential Home Development Industrial Municipal Real Estate Real Estate Consumer Equity Unallocated Total (in thousands) Allowance for loan losses: Balance at December 31, 2019 $ 331 $ 11,596 $ 2,566 $ 11,464 $ 2,194 $ 312 $ 1,065 $ 57 $ 29,585 Charge-offs — (5 ) — — — (57 ) — — (62 ) Recoveries — 164 — — — 37 5 — 206 Provision (85 ) 673 323 (343 ) 255 4 67 181 1,075 Ending balance at March 31, 2020 $ 246 $ 12,428 $ 2,889 $ 11,121 $ 2,449 $ 296 $ 1,137 $ 238 $ 30,804 Amount of allowance for loan losses for loans deemed to be impaired $ — $ — $ — $ 85 $ — $ — $ — $ — $ 85 Amount of allowance for loan losses for loans not deemed to be impaired $ 246 $ 12,428 $ 2,889 $ 11,036 $ 2,449 $ 296 $ 1,137 $ 238 $ 30,719 Loans: Ending balance $ 6,493 $ 867,599 $ 141,588 $ 761,464 $ 393,338 $ 21,039 $ 307,373 $ — $ 2,498,894 Loans deemed to be impaired $ — $ 623 $ — $ 2,322 $ — $ — $ — $ — $ 2,945 Loans not deemed to be impaired $ 6,493 $ 866,976 $ 141,588 $ 759,142 $ 393,338 $ 21,039 $ 307,373 $ — $ 2,495,949 Further information pertaining to the allowance for loan losses for the three months ending March 31, 2019 is as follows: Construction Commercial and Land and Commercial Residential Home Development Industrial Municipal Real Estate Real Estate Consumer Equity Unallocated Total (in thousands) Allowance for loan losses: Balance at December 31, 2018 $ 1,092 $ 10,998 $ 1,838 $ 10,663 $ 2,190 $ 365 $ 1,111 $ 286 $ 28,543 Charge-offs — (43 ) — — — (99 ) — — (142 ) Recoveries — 18 — — — 54 — — 72 Provision (81 ) 183 160 104 (55 ) 22 (10 ) 52 375 Ending balance at March 31, 2019 $ 1,011 $ 11,156 $ 1,998 $ 10,767 $ 2,135 $ 342 $ 1,101 $ 338 $ 28,848 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 6 $ — $ 94 $ — $ — $ — $ — $ 100 Amount of allowance for loan losses for loans not deemed to be impaired $ 1,011 $ 11,150 $ 1,998 $ 10,673 $ 2,135 $ 342 $ 1,101 $ 338 $ 28,748 Loans: Ending balance $ 13,305 $ 767,436 $ 105,288 $ 746,703 $ 349,966 $ 22,123 $ 305,839 $ — $ 2,310,660 Loans deemed to be impaired $ — $ 320 $ — $ 2,946 $ — $ — $ — $ — $ 3,266 Loans not deemed to be impaired $ 13,305 $ 767,116 $ 105,288 $ 743,757 $ 349,966 $ 22,123 $ 305,839 $ — $ 2,307,394
Loans by Risk Rating	The following table presents the Company’s loans by risk rating at March 31, 2020. Construction Commercial and Land and Commercial Development Industrial Municipal Real Estate (in thousands) Grade: 1-3 $ 6,493 $ 863,026 $ 141,588 $ 734,992 4 (Monitor) — 3,950 — 24,150 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 623 — 2,322 Total $ 6,493 $ 867,599 $ 141,588 $ 761,464 The following table presents the Company’s loans by risk rating at December 31, 2019. Construction Commercial and Land and Commercial Development Industrial Municipal Real Estate (in thousands) Grade: 1-3 $ 8,992 $ 807,486 $ 120,455 $ 759,402 4 (Monitor) — 4,025 — 24,354 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 906 — 2,346 Total $ 8,992 $ 812,417 $ 120,455 $ 786,102
Loans by Credit Rating	Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at March 31, 2020 and are included within the total loan portfolio. Commercial Commercial and Real Industrial Municipal Estate Total (in thousands) Credit Rating: Aaa – Aa3 $ 568,173 $ 74,406 $ 38,955 $ 681,534 A1 – A3 185,819 7,354 147,953 341,126 Baa1 – Baa3 — 51,133 143,302 194,435 Ba2 — 5,895 — 5,895 Total $ 753,992 $ 138,788 $ 330,210 $ 1,222,990 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2019. Commercial Commercial and Real Industrial Municipal Estate Total (in thousands) Credit Rating: Aaa – Aa3 $ 523,644 $ 53,273 $ 40,437 $ 617,354 A1 – A3 186,044 7,354 148,346 341,744 Baa1 – Baa3 — 51,133 144,711 195,844 Ba2 — 5,895 — 5,895 Total $ 709,688 $ 117,655 $ 333,494 $ 1,160,837
Aging of Past Due Loan Losses	Further information pertaining to the allowance for loan losses at March 31, 2020 follows: Accruing Accruing Greater Total 30-89 Days Non than Past Current Past Due Accrual 90 Days Due Loans Total (in thousands) Construction and land development $ — $ — $ — $ — $ 6,493 $ 6,493 Commercial and industrial 337 374 — 711 866,888 867,599 Municipal — — — — 141,588 141,588 Commercial real estate 2,322 238 — 2,560 758,904 761,464 Residential real estate 2,455 890 — 3,345 389,993 393,338 Consumer and overdrafts 17 6 — 23 21,016 21,039 Home equity 1,450 193 — 1,643 305,730 307,373 Total $ 6,581 $ 1,701 $ — $ 8,282 $ 2,490,612 $ 2,498,894 Further information pertaining to the allowance for loan losses at December 31, 2019 follows: Accruing Accruing Greater Total 30-89 Days Non than Past Current Past Due Accrual 90 Days Due Loans Total (in thousands) Construction and land development $ — $ — $ — $ — $ 8,992 $ 8,992 Commercial and industrial 227 400 — 627 811,790 812,417 Municipal — — — — 120,455 120,455 Commercial real estate 840 492 — 1,332 784,770 786,102 Residential real estate 1,563 683 — 2,246 369,651 371,897 Consumer and overdrafts 18 4 — 22 21,871 21,893 Home equity 603 435 — 1,038 303,325 304,363 Total $ 3,251 $ 2,014 $ — $ 5,265 $ 2,420,854 $ 2,426,119
Information Pertaining to Impaired Loans	The following is information pertaining to impaired loans for March 31, 2020: Average Interest Carrying Income Value Recognized for 3 for 3 Unpaid Months Months Carrying Principal Required Ending Ending Value Balance Reserve 3/31/20 3/31/20 (in thousands) With no required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 623 641 — 582 1 Municipal — — — — — Commercial real estate 155 185 — 157 — Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 778 $ 826 $ — $ 739 $ 1 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial — — — 113 1 Municipal — — — — — Commercial real estate 2,167 2,290 85 2,176 22 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,167 $ 2,290 $ 85 $ 2,289 $ 23 Total: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 623 641 — 695 2 Municipal — — — — — Commercial real estate 2,322 2,475 85 2,333 22 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,945 $ 3,116 $ 85 $ 3,028 $ 24 The following is information pertaining to impaired loans for March 31, 2019: Average Interest Carrying Income Value Recognized Unpaid for 3 Months for 3 Months Carrying Principal Required Ending Ending Value Balance Reserve 3/31/19 3/31/19 (in thousands) With no required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 93 306 — 87 2 Municipal — — — — — Commercial real estate 182 206 — 188 — Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 275 $ 512 $ — $ 275 $ 2 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 227 228 6 262 3 Municipal — — — — — Commercial real estate 2,764 2,881 94 2,694 24 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 2,991 $ 3,109 $ 100 $ 2,956 $ 27 Total: Construction and land development $ — $ — $ — $ — $ — Commercial and industrial 320 534 6 349 5 Municipal — — — — — Commercial real estate 2,946 3,087 94 2,882 24 Residential real estate — — — — — Consumer — — — — — Home equity — — — — — Total $ 3,266 $ 3,621 $ 100 $ 3,231 $ 29

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2020
Text Block [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income	Amount Reclassified from Accumulated Other Comprehensive Income Three Three Affected Line Item in the Details about Accumulated Other Months Ended Months Ended Statement where Net Income is Comprehensive Income Components March 31, 2020 March 31, 2019 Presented (in thousands) Accretion of unrealized losses transferred $ (222 ) $ (294 ) Securities held-to-maturity Tax (expense) or benefit 58 78 Provision for income taxes Net of tax $ (164 ) $ (216 ) Net income Amortization of defined benefit pension items Prior-service costs $ (29 ) $ (29 )(b) Salaries and employee benefits Actuarial gains (losses) (472 ) (337 )(b) Salaries and employee benefits Total before tax (501 ) (366 ) Income before taxes Tax (expense) or benefit 141 103 Provision for income taxes Net of tax $ (360 ) $ (263 ) Net income (a) Amount in parentheses indicates reductions to net income. (b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Employee Benefits footnote (Note 7) for additional details).

Earnings per share ("EPS") (Tab

Earnings per share ("EPS") (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Reconciliation of Basic EPS and Diluted EPS	The following table is a reconciliation of basic EPS and diluted EPS. Three Months Ended March 31, (in thousands except share and per share data) 2020 2019 Basic EPS Computation: Numerator: Net income, Class A $ 7,658 $ 7,409 Net income, Class B 2,008 2,009 Denominator: Weighted average shares outstanding, Class A 3,652,349 3,610,329 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Basic EPS, Class A $ 2.10 $ 2.05 Basic EPS, Class B 1.05 1.03 Diluted EPS Computation: Numerator: Net income, Class A $ 7,658 $ 7,409 Net income, Class B 2,008 2,009 Total net income, for diluted EPS, Class A computation 9,666 9,418 Denominator: Weighted average shares outstanding, basic, Class A 3,652,349 3,610,329 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Weighted average shares outstanding diluted, Class A 5,567,909 5,567,909 Weighted average shares outstanding, Class B 1,915,560 1,957,580 Diluted EPS, Class A $ 1.74 $ 1.69 Diluted EPS, Class B 1.05 1.03

Employee Benefits (Tables)

Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost	Supplemental Insurance/ Pension Benefits Retirement Plan 2020 2019 2020 2019 (in thousands) Service cost $ 344 $ 276 $ 353 $ 256 Interest 450 473 466 482 Expected return on plan assets (952 ) (819 ) — — Recognized prior service cost (benefit) — — 29 28 Recognized net actuarial losses 261 229 211 109 Net periodic benefit (credit) cost $ 103 $ 159 $ 1,059 $ 875

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis	The results of the fair value hierarchy as of March 31, 2020, are as follows: Financial Instruments Measured at Fair Value on a Recurring Basis: Securities AFS Fair Value Measurements Using Quoted Prices In Active Significant Markets for Significant Other Identical Observable Unobservable Carrying Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (in thousands) SBA Backed Securities $ 50,615 $ — $ 50,615 $ — U.S. Government Agency and Sponsored Mortgage-Backed Securities 206,215 — 206,215 — Privately Issued Residential Mortgage- Backed Securities 334 — 334 — Obligations Issued by States and Political Subdivisions 17,224 — — 17,224 Other Debt Securities 3,631 — 3,631 — Total Debt Securities $ 278,019 $ — $ 260,795 $ 17,224 Equity Securities $ 1,609 $ 243 $ 1,366 $ — Financial Instruments Measured at Fair Value on a Non-recurring Impaired Loans $ 608 $ — $ — $ 608 The results of the fair value hierarchy as of December 31, 2019, are as follows: Financial Instruments Measured at Fair Value on a Recurring Basis: Securities AFS Fair Value Measurements Using Quoted Prices In Active Significant Markets for Significant Other Identical Observable Unobservable Carrying Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (in thousands) SBA Backed Securities $ 54,211 $ — $ 54,211 $ — U.S. Government Agency and Sponsored Mortgage-Backed Securities 184,187 — 184,187 — Privately Issued Residential Mortgage-Backed Securities 396 — 396 — Obligations Issued by States and Political Subdivisions 18,076 — 4,775 13,301 Other Debt Securities 3,632 3,632 — Total $ 260,502 $ — $ 247,201 $ 13,301 Financial Instruments Measured at Fair Value on a Recurring Basis Equity Securities $ 1,688 $ 343 $ 1,345 $ — Financial Instruments Measured at Fair Value on a Non-recurring $ 877 $ — $ — $ 877
Assets Measured at Fair Value	The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Unobservable Input Asset Fair Value Valuation Technique Unobservable Input Value or Range Securities AFS $ 17,224 Discounted cash flow Discount rate 0%-1% (3) Impaired Loans $ 608 Appraisal of collateral (1) Appraisal adjustments (2) 0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages. The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Unobservable Input Asset Fair Value Valuation Technique Unobservable Input Value or Range Securities AFS $ 13,301 Discounted cash flow Discount rate 1.5%-3.2% (3) Impaired Loans $ 877 Appraisal of collateral (1) Appraisal adjustments (2) 0%-30% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages.
Changes in Level 3 Securities	The changes in Level 3 securities for the three-month period ended March 31, 2020 are shown in the table below: Obligations Issued by States & Political Subdivisions Balance at December 31, 2019 $ 13,301 Purchases 9,372 Maturities and calls (5,449 ) Amortization — Balance at March 31, 2020 $ 17,224 The changes in Level 3 securities for the three-month period ended March 31, 2019, are shown in the table below: Obligations Issued by States & Political Subdivisions Balance at December 31, 2018 $ 88,728 Purchases 970 Maturities and calls (26,352 ) Amortization (14 ) Changes in fair value — Balance at March 31, 2019 $ 63,332

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2020
Investments, All Other Investments [Abstract]
Carrying Amounts and Fair Values of Company's Financial Instruments	Fair Value Carrying Estimated Measurements Level 2 Level 3 March 31, 2020 Amount Fair Value Level 1 Inputs Inputs Inputs (in thousands) Financial assets: Securities held-to-maturity $ 2,304,074 $ 2,365,027 $ — $ 2,365,027 $ — Loans (1) 2,468,090 2,437,099 — — 2,437,099 Financial liabilities: Time deposits 612,849 621,553 — 621,553 — Other borrowed funds 312,120 320,830 — 320,830 — Subordinated debentures 36,083 36,083 — 36,083 — December 31, 2019 Financial assets: Securities held-to-maturity $ 2,351,120 $ 2,361,304 $ — $ 2,361,304 $ — Loans (1) 2,396,534 2,424,770 — — 2,424,770 Financial liabilities: Time deposits 555,447 560,746 — 560,746 — Other borrowed funds 370,955 374,531 — 374,531 — Subordinated debentures 36,083 36,083 — 36,083 — (1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Revenue From Contracts	The following table presents total revenues as presented in the Consolidated Statements of Income and the related amounts which are from contracts with customers within the scope of Topic 606. As illustrated here, the vast majority of our revenues are specifically excluded from the scope of Topic 606. Three Revenue from Three Revenue from Months Contracts in Months Contracts in Ended Scope of Ended Scope of 3/31/2020 Topic 606 3/31/2019 Topic 606 (dollars in thousands) Total interest income $ 25,201 $ — $ 23,438 $ — Noninterest income: Service charges on deposit accounts 2,296 2,296 2,209 2,209 Lockbox fees 930 930 1,089 1,089 Gains on sales of mortgage loans — — 15 — Other income 1,084 599 1,114 800 Total noninterest income 4,310 3,825 4,427 4,098 Total revenues $ 29,511 $ 3,825 $ 27,865 $ 4,098
Information about Receivables with Customers	The following table provides information about receivables with customers. March 31, 2020 December 31, 2019 (dollars in thousands) Receivables, which are included in “Other assets” $ 1,236 $ 1,200

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Components of lease expense	The components of lease expense were as follows: Three Three Months Months Ended Ended 3/31/2020 3/31/2019 (in thousands) Operating lease cost $ 546 $ 563 Variable lease cost 133 148 Total lease cost $ 679 $ 711
Supplemental cash flow information related to leases	Supplemental cash flow information related to leases was as follows: Three Three Months Months Ended Ended 3/31/2020 3/31/2019 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 529 $ 538 Right-of-use Operating leases $ 421 $ 443
Supplemental balance sheet information related to leases	Supplemental balance sheet information related to leases was as follows: 3/31/2020 12/31/2019 (in thousands, except lease term and discount rate) Operating Leases: Operating lease right-of-use $ 12,085 $ 12,521 Operating lease liabilities $ 12,267 $ 12,690 Weighted Average Remaining Lease Term: Operating Leases 11 years 11 years Weighted Average Discount Rate: Operating Leases 3.5 % 3.5 %
Maturities of lease liabilities	A summary of future minimum rental payments under such leases as the dates indicated follows: Minimum Rental Payments March 31, 2020 December 31, 2019 (in thousands) Year Ending December 31, 2020 $ 1,502 $ 2,030 2021 1,754 1,754 2022 1,603 1,603 2023 1,545 1,545 2024 1,277 1,277 Thereafter 7,311 7,312 Total lease payments $ 14,992 $ 15,521 Less imputed interest (2,725 ) (2,831 ) Present value of lease liability $ 12,267 $ 12,690

Basis of Financial Statement _2

Basis of Financial Statement Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020Segment
Number of Reportable Segments	1
Century Bancorp Capital Trust II [Member]
Equity ownership interest	100.00%

Securities Available-for-Sale -

Securities Available-for-Sale - Summary of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 280,520	$ 260,924
Gross Unrealized Gains	224	274
Gross Unrealized Losses	2,725	696
Total, Fair Value	278,019	260,502
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,722	54,331
Gross Unrealized Gains	25	23
Gross Unrealized Losses	132	143
Total, Fair Value	50,615	54,211
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	208,596	184,580
Gross Unrealized Gains	157	139
Gross Unrealized Losses	2,538	532
Total, Fair Value	206,215	184,187
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	378	397
Gross Unrealized Gains	0	1
Gross Unrealized Losses	44	2
Total, Fair Value	334	396
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,224	18,016
Gross Unrealized Gains	0	60
Total, Fair Value	17,224	18,076
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,600	3,600
Gross Unrealized Gains	42	51
Gross Unrealized Losses	11	19
Total, Fair Value	$ 3,631	$ 3,632

Securities Available-for-Sale_2

Securities Available-for-Sale - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)Security	Dec. 31, 2019USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 1,916,047,000	$ 1,776,399,000
Securities available-for-sale are securities at fair value pledged for borrowing	30,619,000	32,297,000
Securities at floating rate or adjustable rate	260,560,000
Sales of securities available for sale	0	0
Federal Reserve Bank Discount Window [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale are securities at fair value pledged for borrowing	$ 9,706,000	$ 0
Securities AFS [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted average remaining life of investment securities available-for-sale	5 years
Number of securities, temporarily impaired for less than 12 months | Security	56	45
Number of securities, temporarily impaired for 12 months or longer | Security	25	18
Number of securities, temporarily impaired, total | Security		122
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 185,943,000	$ 186,245,000

Securities Available-for-Sale_3

Securities Available-for-Sale - Estimated Maturity Distribution of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 18,618
After one but within five years, Amortized Cost	149,846
After five but within ten years, Amortized Cost	107,266
More than ten years, Amortized Cost	4,790
Amortized Cost	280,520	$ 260,924
Within one year, Fair Value	18,568
After one but within five years, Fair Value	148,675
After five but within ten years, Fair Value	105,995
More than ten years, Fair Value	4,781
Total, Fair Value	$ 278,019	$ 260,502

Securities Available-for-Sale_4

Securities Available-for-Sale - Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 145,900	$ 124,418
Less Than 12 Months, Unrealized Losses	1,915	412
12 Months or Longer, Fair Value	64,450	51,751
12 Months or Longer, Unrealized Losses	810	284
Total, Fair Value	210,350	176,169
Total, Unrealized Losses	2,725	696
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	12,806	14,560
Less Than 12 Months, Unrealized Losses	25	30
12 Months or Longer, Fair Value	20,687	22,092
12 Months or Longer, Unrealized Losses	107	113
Total, Fair Value	33,493	36,652
Total, Unrealized Losses	132	143
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	131,960	108,806
Less Than 12 Months, Unrealized Losses	1,846	379
12 Months or Longer, Fair Value	43,274	29,178
12 Months or Longer, Unrealized Losses	692	153
Total, Fair Value	175,234	137,984
Total, Unrealized Losses	2,538	532
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	334	252
Less Than 12 Months, Unrealized Losses	44	2
Total, Fair Value	334	252
Total, Unrealized Losses	44	2
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	800	800
Less Than 12 Months, Unrealized Losses		1
12 Months or Longer, Fair Value	489	481
12 Months or Longer, Unrealized Losses	11	18
Total, Fair Value	1,289	1,281
Total, Unrealized Losses	$ 11	$ 19

Investment Securities Held-to_3

Investment Securities Held-to-Maturity - Summary of Held-to-Maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,304,074	$ 2,351,120
Gross Unrealized Gains	62,642	21,429
Gross Unrealized Losses	1,689	11,245
Estimated Fair Value	2,365,027	2,361,304
U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	89,419	98,867
Gross Unrealized Gains	1,113	527
Gross Unrealized Losses		96
Estimated Fair Value	90,532	99,298
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	42,856	44,379
Gross Unrealized Gains	492	182
Gross Unrealized Losses	69	303
Estimated Fair Value	43,279	44,258
U.S. Government Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,171,799	2,207,874
Gross Unrealized Gains	61,037	20,720
Gross Unrealized Losses	1,620	10,846
Estimated Fair Value	$ 2,231,216	$ 2,217,748

Investment Securities Held-to_4

Investment Securities Held-to-Maturity - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020USD ($)Security	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)Security
Schedule of Held-to-maturity Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 1,916,047,000		$ 1,776,399,000
Securities pledged for borrowing at the Federal Home Loan Bank	196,469,000		$ 0
Securities held to maturity at floating rate or adjustable rate	102,000
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Sales of held-to-maturity securities	$ 0	$ 0
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life of investment securities held-to-maturity	3 years 4 months 24 days
Number of securities, temporarily impaired for less than 12 months | Security	34		114
Number of securities, temporarily impaired for 12 months or longer | Security	19		103
Number of securities, temporarily impaired, total | Security	533		531
Held-to-Maturity Securities [Member] | U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life	$ 19,000,000
Federal Home Loan Bank [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged for borrowing at the Federal Home Loan Bank	$ 383,904,000		$ 399,646,000

Investment Securities Held-to_5

Investment Securities Held-to-Maturity - Company's Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 90,437
After one but within five years, Amortized Cost	1,921,419
After five but within ten years, Amortized Cost	280,016
More than ten years, Amortized Cost	12,202
Amortized Cost	2,304,074	$ 2,351,120
Within one year, Fair Value	91,896
After one but within five years, Fair Value	1,971,224
After five but within ten years, Fair Value	289,074
More than ten years, Fair Value	12,833
Estimated Fair Value	$ 2,365,027	$ 2,361,304

Investment Securities Held-to_6

Investment Securities Held-to-Maturity - Unrealized Market Loss of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	$ 209,859	$ 663,576
Less Than 12 Months, Unrealized Losses	980	4,324
12 Months or Longer, Fair Value	53,703	399,895
12 Months or Longer, Unrealized Losses	709	6,921
Total, Fair Value	263,562	1,063,471
Total, Unrealized Losses	1,689	11,245
U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value		24,420
Less Than 12 Months, Unrealized Losses		72
12 Months or Longer, Fair Value		9,976
12 Months or Longer, Unrealized Losses		24
Total, Fair Value		34,396
Total, Unrealized Losses		96
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	12,725	25,251
Less Than 12 Months, Unrealized Losses	69	303
Total, Fair Value	12,725	25,251
Total, Unrealized Losses	69	303
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	197,134	613,905
Less Than 12 Months, Unrealized Losses	911	3,949
12 Months or Longer, Fair Value	53,703	389,919
12 Months or Longer, Unrealized Losses	709	6,897
Total, Fair Value	250,837	1,003,824
Total, Unrealized Losses	$ 1,620	$ 10,846

Allowance for Loan Losses - Ana

Allowance for Loan Losses - Analysis of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Receivables [Abstract]
Allowance for loan losses, beginning of period	$ 29,585	$ 28,543
Loans charged-off	(62)	(142)
Recoveries on loans previously charged-off	206	72
Net recoveries (charge-offs)	144	(70)
Provision charged to expense	1,075	375
Allowance for loan losses, end of period	$ 30,804	$ 28,848

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	$ 29,585	$ 28,543
Charge-offs	(62)	(142)
Recoveries	206	72
Provision	1,075	375
Allowance for loan losses, end of period	30,804	28,848
Amount of allowance for loan losses for loans deemed to be impaired	85	100
Amount of allowance for loan losses for loans not deemed to be impaired	30,719	28,748
Loans:
Total loans, net	2,498,894	2,310,660	$ 2,426,119
Loans deemed to be impaired	2,945	3,266
Loans not deemed to be impaired	2,495,949	2,307,394
Construction and Land Development [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	331	1,092
Provision	(85)	(81)
Allowance for loan losses, end of period	246	1,011
Amount of allowance for loan losses for loans not deemed to be impaired	246	1,011
Loans:
Total loans, net	6,493	13,305	8,992
Loans not deemed to be impaired	6,493	13,305
Commercial and Industrial [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	11,596	10,998
Charge-offs	(5)	(43)
Recoveries	164	18
Provision	673	183
Allowance for loan losses, end of period	12,428	11,156
Amount of allowance for loan losses for loans deemed to be impaired		6
Amount of allowance for loan losses for loans not deemed to be impaired	12,428	11,150
Loans:
Total loans, net	867,599	767,436	812,417
Loans deemed to be impaired	623	320
Loans not deemed to be impaired	866,976	767,116
Municipal [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	2,566	1,838
Provision	323	160
Allowance for loan losses, end of period	2,889	1,998
Amount of allowance for loan losses for loans not deemed to be impaired	2,889	1,998
Loans:
Total loans, net	141,588	105,288	120,455
Loans not deemed to be impaired	141,588	105,288
Commercial Real Estate [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	11,464	10,663
Provision	(343)	104
Allowance for loan losses, end of period	11,121	10,767
Amount of allowance for loan losses for loans deemed to be impaired	85	94
Amount of allowance for loan losses for loans not deemed to be impaired	11,036	10,673
Loans:
Total loans, net	761,464	746,703	786,102
Loans deemed to be impaired	2,322	2,946
Loans not deemed to be impaired	759,142	743,757
Residential Real Estate [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	2,194	2,190
Provision	255	(55)
Allowance for loan losses, end of period	2,449	2,135
Amount of allowance for loan losses for loans not deemed to be impaired	2,449	2,135
Loans:
Total loans, net	393,338	349,966	371,897
Loans not deemed to be impaired	393,338	349,966
Consumer [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	312	365
Charge-offs	(57)	(99)
Recoveries	37	54
Provision	4	22
Allowance for loan losses, end of period	296	342
Amount of allowance for loan losses for loans not deemed to be impaired	296	342
Loans:
Total loans, net	21,039	22,123	21,893
Loans not deemed to be impaired	21,039	22,123
Home Equity [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	1,065	1,111
Recoveries	5
Provision	67	(10)
Allowance for loan losses, end of period	1,137	1,101
Amount of allowance for loan losses for loans not deemed to be impaired	1,137	1,101
Loans:
Total loans, net	307,373	305,839	$ 304,363
Loans not deemed to be impaired	307,373	305,839
Unallocated [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	57	286
Provision	181	52
Allowance for loan losses, end of period	238	338
Amount of allowance for loan losses for loans not deemed to be impaired	$ 238	$ 338

Allowance for Loan Losses - Loa

Allowance for Loan Losses - Loans by Risk Rating (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Loans by risk rating
Financing Receivable, Net	$ 2,498,894	$ 2,426,119	$ 2,310,660
Construction and Land Development [Member]
Loans by risk rating
Financing Receivable, Net	6,493	8,992	13,305
Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	867,599	812,417	767,436
Municipal [Member]
Loans by risk rating
Financing Receivable, Net	141,588	120,455	105,288
Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	761,464	786,102	$ 746,703
1-3 (Pass) [Member] | Construction and Land Development [Member]
Loans by risk rating
Financing Receivable, Net	6,493	8,992
1-3 (Pass) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	863,026	807,486
1-3 (Pass) [Member] | Municipal [Member]
Loans by risk rating
Financing Receivable, Net	141,588	120,455
1-3 (Pass) [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	734,992	759,402
4 (Monitor) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	3,950	4,025
4 (Monitor) [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	24,150	24,354
Impaired [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	623	906
Impaired [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	$ 2,322	$ 2,346

Allowance for Loan Losses - L_2

Allowance for Loan Losses - Loans by Credit Rating (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 1,222,990	$ 1,160,837
Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	681,534	617,354
A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	341,126	341,744
Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	194,435	195,844
Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	5,895	5,895
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	753,992	709,688
Commercial and Industrial [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	568,173	523,644
Commercial and Industrial [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	185,819	186,044
Municipal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	138,788	117,655
Municipal [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	74,406	53,273
Municipal [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	7,354	7,354
Municipal [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	51,133	51,133
Municipal [Member] | Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	5,895	5,895
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	330,210	333,494
Commercial Real Estate [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	38,955	40,437
Commercial Real Estate [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	147,953	148,346
Commercial Real Estate [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 143,302	$ 144,711

Allowance for Loan Losses - Agi

Allowance for Loan Losses - Aging of Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	$ 6,581	$ 3,251
Non Accrual	1,701	2,014
Total Past Due	8,282	5,265
Current Loans	2,490,612	2,420,854
Total loans, net	2,498,894	2,426,119	$ 2,310,660
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current Loans	6,493	8,992
Total loans, net	6,493	8,992	13,305
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	337	227
Non Accrual	374	400
Total Past Due	711	627
Current Loans	866,888	811,790
Total loans, net	867,599	812,417	767,436
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current Loans	141,588	120,455
Total loans, net	141,588	120,455	105,288
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	2,322	840
Non Accrual	238	492
Total Past Due	2,560	1,332
Current Loans	758,904	784,770
Total loans, net	761,464	786,102	746,703
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	2,455	1,563
Non Accrual	890	683
Total Past Due	3,345	2,246
Current Loans	389,993	369,651
Total loans, net	393,338	371,897	349,966
Consumer and overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	17	18
Non Accrual	6	4
Total Past Due	23	22
Current Loans	21,016	21,871
Total loans, net	21,039	21,893	22,123
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	1,450	603
Non Accrual	193	435
Total Past Due	1,643	1,038
Current Loans	305,730	303,325
Total loans, net	$ 307,373	$ 304,363	$ 305,839

Allowance for Loan Losses - Inf

Allowance for Loan Losses - Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	$ 778	$ 275
With no required reserve recorded, Unpaid Balance Principal	826	512
With no required reserve recorded, Average Carrying Value Recognized	739	275
With no required reserve recorded, Interest Income	1	2
With required reserve recorded, Carrying Value	2,167	2,991
With required reserve recorded, Unpaid Balance Principal	2,290	3,109
With required reserve recorded, Required Reserve	85	100
With required reserve recorded, Average Carrying Value Recognized	2,289	2,956
With required reserve recorded, Interest Income	23	27
Carrying Value	2,945	3,266
Unpaid Balance Principal	3,116	3,621
With required reserve recorded, Required Reserve	85	100
Average Carrying Value Recognized	3,028	3,231
Interest Income	24	29
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	623	93
With no required reserve recorded, Unpaid Balance Principal	641	306
With no required reserve recorded, Average Carrying Value Recognized	582	87
With no required reserve recorded, Interest Income	1	2
With required reserve recorded, Carrying Value	0	227
With required reserve recorded, Unpaid Balance Principal		228
With required reserve recorded, Required Reserve		6
With required reserve recorded, Average Carrying Value Recognized	113	262
With required reserve recorded, Interest Income	1	3
Carrying Value	623	320
Unpaid Balance Principal	641	534
With required reserve recorded, Required Reserve		6
Average Carrying Value Recognized	695	349
Interest Income	2	5
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	155	182
With no required reserve recorded, Unpaid Balance Principal	185	206
With no required reserve recorded, Average Carrying Value Recognized	157	188
With required reserve recorded, Carrying Value	2,167	2,764
With required reserve recorded, Unpaid Balance Principal	2,290	2,881
With required reserve recorded, Required Reserve	85	94
With required reserve recorded, Average Carrying Value Recognized	2,176	2,694
With required reserve recorded, Interest Income	22	24
Carrying Value	2,322	2,946
Unpaid Balance Principal	2,475	3,087
With required reserve recorded, Required Reserve	85	94
Average Carrying Value Recognized	2,333	2,882
Interest Income	$ 22	$ 24

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020
Extended Maturity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Description Of Covid Nineteen Loan Modifications Aggregating Deferral Principal	As of March 31, 2020, and as a result of COVID-19 loan modification, the Company had modified 58 loans aggregating $32,073,000, primarily consisting of the deferral of principal and/or the extension of the maturity date. Of these modifications, $32,073,000, or 100%, were performing in accordance with their modified terms.

Reclassifications Out of Accu_3

Reclassifications Out of Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ (597)	$ 118
Net income	9,666	9,418
Salaries and employee benefits	(11,371)	(11,035)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accretion of Unrealized Losses Transferred [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities	(222)	(294)
Provision for income taxes	58	78
Net income	(164)	(216)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Prior-Service Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(29)	(29)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Actuarial Gains (Losses) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(472)	(337)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Amortization of Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before taxes	(501)	(366)
Provision for income taxes	141	103
Net income	$ (360)	$ (263)

Earnings per Share ("EPS") - Ad

Earnings per Share ("EPS") - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020
Class A Common Stock [Member] | Minimum [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Class A common stock entitled dividend per share percent in comparison to Class B common stock	200.00%

Earnings Per Share ("EPS") - Re

Earnings Per Share ("EPS") - Reconciliation of Basic EPS and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 9,666	$ 9,418
Class A Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 7,658	$ 7,409
Weighted average shares outstanding, basic	3,652,349	3,610,329
Basic earnings per share	$ 2.10	$ 2.05
Net income	$ 7,658	$ 7,409
Weighted average shares outstanding, diluted	5,567,909	5,567,909
Diluted earnings per share	$ 1.74	$ 1.69
Class B Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,008	$ 2,009
Weighted average shares outstanding, basic	1,915,560	1,957,580
Basic earnings per share	$ 1.05	$ 1.03
Net income	$ 2,008	$ 2,009
Weighted average shares outstanding, diluted	1,915,560	1,957,580
Diluted earnings per share	$ 1.05	$ 1.03

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 465,000	$ 502,000

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Pension Plan [Member]
Components of net periodic benefit cost
Service cost	$ 344	$ 276
Interest cost	450	473
Expected return on plan assets	(952)	(819)
Recognized net losses	261	229
Net periodic benefit cost (credit)	103	159
Supplemental Insurance/ Retirement Plan [Member]
Components of net periodic benefit cost
Service cost	353	256
Interest cost	466	482
Recognized prior service cost	29	28
Recognized net losses	211	109
Net periodic benefit cost (credit)	$ 1,059	$ 875

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Specific adjustments to impaired loans recognized	$ 9,000		$ 79,000
Amortized cost of Level 3 securities	1,635,000		1,635,000
Liabilities measured at fair value on a recurring or nonrecurring basis	0	$ 0
Transfers between level 1, 2 and 3			$ 0
Real Estate, Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of loans		0
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of loans	269,000	56,000
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized cost of Level 3 securities	17,224,000	63,332,000
Unrealized loss	$ 0	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Mar. 31, 2019
Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 17,224	$ 13,301
Valuation Technique	Discounted cash flow	Discounted cash flow
Unobservable Input	Discount rate	Discount rate
Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 608	$ 877
Valuation Technique	Appraisal of collateral (1)	Appraisal of collateral (1)
Unobservable Input	Appraisal adjustments (2)	Appraisal adjustments (2)
Minimum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities AFS, Unobservable Input Value or Range	0		150
Minimum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impaired Loans, Unobservable Input Value or Range	0		0
Maximum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities AFS, Unobservable Input Value or Range	(100)		(320)
Maximum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impaired Loans, Unobservable Input Value or Range			(3,000)

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Securities (Detail) - Obligations Issued by States and Political Subdivisions [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 13,301	$ 88,728
Purchases	9,372	970
Maturities/redemptions	(5,449)	(26,352)
Amortization		(14)
Ending Balance	$ 17,224	$ 63,332

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	$ 278,019	$ 260,502
Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		343
Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	260,795	247,201
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		1,345
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	17,224	13,301
Financial Instruments Measured at Fair Value on a Non-recurring Basis Impaired Loans	608	877
SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	50,615	54,211
SBA Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	50,615	54,211
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	206,215	184,187
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	206,215	184,187
Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	334	396
Privately Issued Residential Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	334	396
Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	17,224	18,076
Obligations Issued by States and Political Subdivisions [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS		4,775
Obligations Issued by States and Political Subdivisions [Member] | Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	17,224	13,301
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	3,631	3,632
Other Debt Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	3,631	3,632
Equity Securities [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	243
Equity Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	1,366
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	278,019	260,502
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		1,688
Financial Instruments Measured at Fair Value on a Non-recurring Basis Impaired Loans	608	877
Carrying Value [Member] | SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	50,615	54,211
Carrying Value [Member] | U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	206,215	184,187
Carrying Value [Member] | Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	334	396
Carrying Value [Member] | Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	17,224	18,076
Carrying Value [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	3,631	$ 3,632
Carrying Value [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	$ 1,609

Fair Values of Financial Inst_3

Fair Values of Financial Instruments - Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Financial assets:
Securities held-to-maturity		$ 2,304,074	$ 2,351,120
Loans		2,468,090	2,396,534
Financial liabilities:
Time deposits		612,849	555,447
Other borrowed funds		312,120	370,955
Subordinated debentures		36,083	36,083
Carrying Value [Member]
Financial assets:
Securities held-to-maturity		2,304,074	2,351,120
Loans	[1]	2,468,090	2,396,534
Financial liabilities:
Time deposits		612,849	555,447
Other borrowed funds		312,120	370,955
Subordinated debentures		36,083	36,083
Estimated Fair Value [Member]
Financial assets:
Securities held-to-maturity		2,365,027	2,361,304
Loans	[1]	2,437,099	2,424,770
Financial liabilities:
Time deposits		621,553	560,746
Other borrowed funds		320,830	374,531
Subordinated debentures		36,083	36,083
Fair Value Measurements, Level 2 Inputs [Member]
Financial assets:
Securities held-to-maturity		2,365,027	2,361,304
Financial liabilities:
Time deposits		621,553	560,746
Other borrowed funds		320,830	374,531
Subordinated debentures		36,083	36,083
Fair Value Measurements, Level 3 Inputs [Member]
Financial assets:
Loans	[1]	$ 2,437,099	$ 2,424,770
[1]	Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Revenue from Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net interest income	$ 25,201	$ 23,438
Noninterest income:
Service charges on deposit accounts	2,296	2,209
Lockbox fees	930	1,089
Gains on sales of mortgage loans		15
Other income	1,084	1,114
Total noninterest income	4,310	4,427
ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Net interest income	25,201	23,438
Noninterest income:
Service charges on deposit accounts	2,296	2,209
Lockbox fees	930	1,089
Gains on sales of mortgage loans		15
Other income	1,084	1,114
Total noninterest income	4,310	4,427
Total revenues	29,511	27,865
ASU 2014-09 [Member] | Revenue Guidance Contracts in Scope of Topic 606 [Member]
Noninterest income:
Service charges on deposit accounts	2,296	2,209
Lockbox fees	930	1,089
Other income	599	800
Total noninterest income	3,825	4,098
Total revenues	$ 3,825	$ 4,098

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Information about Receivables with Customers (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Assets [Member]
Disaggregation of Revenue [Line Items]
Receivables, which are included in "Other assets"	$ 1,236	$ 1,200

Leases - Additional Information

Leases - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020USD ($)
Operating lease option to extend	options to extend the leases for up to 10 years, and some of which include options to terminate the leases within 1 year.
Sublease Income	$ 9,900
Sublease option to terminate	sublease expires in 2022 with an option to terminate and no option to extend.
Maximum [Member]
Operating lease remaining lease term	32 years
Minimum [Member]
Operating lease remaining lease term	1 year

Leases - Components of lease ex

Leases - Components of lease expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating lease cost	$ 546	$ 563
Variable lease cost	133	148
Total lease cost	$ 679	$ 711

Leases - Supplemental cash flow

Leases - Supplemental cash flow information related to leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 529	$ 538
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 421	$ 443

Leases - Supplemental balance s

Leases - Supplemental balance sheet information related to leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating Leases:
Operating lease right-of-use assets, included in other assets	$ 12,085	$ 12,521
Operating lease liabilities, included in other liabilities	$ 12,267	$ 12,690
Weighted Average Remaining Lease Term:
Operating Leases	11 years	11 years
Weighted Average Discount Rate:
Operating Leases	3.50%	3.50%

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Rental Payments (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
2020	$ 1,502	$ 2,030
2021	1,754	1,754
2022	1,603	1,603
2023	1,545	1,545
2024	1,277	1,277
Thereafter	7,311	7,312
Total lease payments	14,992	15,521
Less imputed interest	(2,725)	(2,831)
Present value of lease liability	$ 12,267	$ 12,690