CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Interest and fees on loans	$ 149,932	$ 126,940	$ 118,198
Interest on mortgage loans held for sale	1,212	1,022	1,293
Taxable interest on securities	21,816	18,927	11,584
Nontaxable interest on securities	61	249	982
Dividends on Federal Home Loan Bank stock	2,369	1,774	1,091
Other interest income	1,017	674	322
Total interest and dividend income	176,407	149,586	133,470
Interest expense:
Deposits	24,175	15,064	12,504
Federal Home Loan Bank advances	19,073	14,377	9,992
Junior subordinated debentures	869	613	491
Other interest expense	0	1	5
Total interest expense	44,117	30,055	22,992
Net interest income	132,290	119,531	110,478
Provision for loan losses	1,550	2,600	5,650
Net interest income after provision for loan losses	130,740	116,931	104,828
Noninterest income:
Wealth management revenues	38,341	39,346	37,569
Mortgage banking revenues	10,381	11,392	13,183
Card interchange fees	3,768	3,502	3,385
Service charges on deposit accounts	3,628	3,672	3,702
Loan related derivative income	2,461	3,214	3,243
Income from bank-owned life insurance	2,196	2,161	2,659
Other income	1,339	1,522	1,388
Total noninterest income	62,114	64,809	65,129
Noninterest expense:
Salaries and employee benefits	69,277	68,891	67,795
Outsourced services	8,684	6,920	5,222
Net occupancy	7,891	7,521	7,151
Equipment	4,312	5,358	6,208
Legal, audit and professional fees	2,427	2,294	2,579
FDIC deposit insurance costs	1,612	1,647	1,878
Advertising and promotion	1,406	1,481	1,458
Amortization of intangibles	979	1,035	1,284
Debt prepayment penalties	0	0	431
Change in fair value of contingent consideration	(187)	(643)	(898)
Other expenses	9,761	9,596	7,995
Total noninterest expense	106,162	104,100	101,103
Income before income taxes	86,692	77,640	68,854
Income tax expense	18,260	31,715	22,373
Net income	68,432	45,925	46,481
Net income available to common shareholders	$ 68,288	$ 45,817	$ 46,384
Weighted average common shares outstanding - basic	17,272	17,207	17,081
Weighted average common shares outstanding - diluted	17,391	17,338	17,208
Per share information:
Basic earnings per common share (in dollars per share)	$ 3.95	$ 2.66	$ 2.72
Diluted earnings per common share (in dollars per share)	3.93	2.64	2.70
Cash dividends declared per share (in dollars per share)	$ 1.76	$ 1.54	$ 1.46