CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest and fees on loans		$ 165,519	$ 149,932	$ 126,940
Interest on mortgage loans held for sale		1,237	1,212	1,022
Taxable interest on debt securities		26,367	21,816	18,927
Nontaxable interest on debt securities		18	61	249
Dividends on Federal Home Loan Bank stock		2,855	2,369	1,774
Other interest income		1,667	1,017	674
Total interest and dividend income		197,663	176,407	149,586
Interest expense:
Deposits		37,101	24,175	15,064
Federal Home Loan Bank advances		26,168	19,073	14,377
Junior subordinated debentures		980	869	613
Other interest expense		0	0	1
Total interest expense		64,249	44,117	30,055
Net interest income	[1]	133,414	132,290	119,531
Provision for loan losses		1,575	1,550	2,600
Net interest income after provision for loan losses		131,839	130,740	116,931
Noninterest income:
Wealth management revenues	[1]	36,848	38,341	39,346
Mortgage banking revenues	[1]	14,795	10,381	11,392
Card interchange fees	[1]	4,214	3,768	3,502
Service charges on deposit accounts	[1]	3,684	3,628	3,672
Loan related derivative income	[1]	3,993	2,461	3,214
Income from bank-owned life insurance	[1]	2,354	2,196	2,161
Net realized losses on securities	[1]	(53)	0	0
Other income	[1]	1,245	1,339	1,522
Total noninterest income	[1]	67,080	62,114	64,809
Noninterest expense:
Salaries and employee benefits		72,761	69,277	68,891
Outsourced services		10,598	8,684	6,920
Net occupancy		7,821	7,891	7,521
Equipment		4,081	4,312	5,358
Legal, audit and professional fees		2,535	2,427	2,294
FDIC deposit insurance costs		618	1,612	1,647
Advertising and promotion		1,534	1,406	1,481
Amortization of intangibles		943	979	1,035
Change in fair value of contingent consideration		0	(187)	(643)
Other expenses		9,849	9,761	9,596
Total noninterest expense		110,740	106,162	104,100
Income before income taxes		88,179	86,692	77,640
Income tax expense		19,061	18,260	31,715
Net income		69,118	68,432	45,925
Net income available to common shareholders		$ 68,979	$ 68,288	$ 45,817
Weighted average common shares outstanding - basic		17,331	17,272	17,207
Weighted average common shares outstanding - diluted		17,414	17,391	17,338
Per share information:
Basic earnings per common share (in dollars per share)		$ 3.98	$ 3.95	$ 2.66
Diluted earnings per common share (in dollars per share)		$ 3.96	$ 3.93	$ 2.64

[1] As reported in the Consolidated Statements of Income.