Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income:
Interest and fees on loans, including loans held for sale	$ 160,198	$ 160,826	$ 164,991
Interest and dividends on securities:
Taxable	13,981	11,939	12,516
Tax exempt	3,098	2,380	2,354
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock	486	532	947
Interest on Federal Reserve Bank deposits	372	704	4,434
Other, including interest on federal funds sold	34	60	156
Total interest income	178,169	176,441	185,398
Interest expense:
Interest on deposits	12,753	21,177	33,371
Interest on repurchase agreements and federal funds purchased	1,254	2,788	4,631
Interest on advances from Federal Home Loan Bank	0	0	39
Interest on long-term debt	1,083	1,485	2,472
Total interest expense	15,090	25,450	40,513
Net interest income	163,079	150,991	144,885
Provision for credit losses (recovery)	(6,386)	16,047	4,819
Net interest income after provision for credit losses (recovery)	169,465	134,944	140,066
Noninterest income:
Service charges on deposit accounts	26,529	23,461	26,359
Gains on sales of loans, net	6,820	7,226	1,880
Trust and wealth management income	12,644	10,931	10,804
Loan related fees	5,578	4,041	2,742
Bank owned life insurance	2,844	2,306	2,397
Brokerage revenue	1,962	1,483	1,367
Securities gains (losses)	(158)	1,769	783
Other noninterest income	4,244	3,343	3,852
Total noninterest income	60,463	54,560	50,184
Noninterest expense:
Officer salaries and employee benefits	19,713	15,257	12,614
Other salaries and employee benefits	54,401	51,170	50,413
Occupancy, net	8,306	7,912	7,845
Equipment	2,548	2,737	3,000
Data processing	8,039	7,941	7,417
Bank franchise tax	1,705	7,299	6,771
Legal fees	1,160	1,634	1,968
Professional fees	2,039	2,091	2,188
Advertising and marketing	2,928	2,980	3,283
FDIC insurance	1,381	1,056	266
Other real estate owned provision and expense	1,401	2,655	5,490
Repossession expense	344	717	1,042
Amortization of limited partnership investments	3,352	3,759	3,422
Other noninterest expense	11,968	12,031	12,539
Total noninterest expense	119,285	119,239	118,258
Income before income taxes	110,643	70,265	71,992
Income taxes	22,704	10,761	7,452
Net income	87,939	59,504	64,540
Unrealized holding gains (losses) on debt securities available-for-sale:
Unrealized holding gains (losses) arising during the period	(24,827)	13,839	14,270
Less: Reclassification adjustments for realized gains included in net income	60	1,251	3
Tax expense (benefit)	(6,471)	3,273	3,403
Other comprehensive income (loss), net of tax	(18,416)	9,315	10,864
Comprehensive income	$ 69,523	$ 68,819	$ 75,404
Basic earnings per share (in dollars per share)	$ 4.94	$ 3.35	$ 3.64
Diluted earnings per share (in dollars per share)	$ 4.94	$ 3.35	$ 3.64
Weighted average shares outstanding-basic (in shares)	17,786	17,748	17,724
Weighted average shares outstanding-diluted (in shares)	17,804	17,756	17,740