CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Interest and fees on loans	$ 127,962	$ 119,491	$ 114,229
Taxable interest on securities	18,927	11,584	8,875
Nontaxable interest on securities	249	982	1,555
Dividends on corporate stock and Federal Home Loan Bank stock	1,774	1,091	953
Other interest income	674	322	138
Total interest and dividend income	149,586	133,470	125,750
Interest expense:
Deposits	15,064	12,504	13,142
Federal Home Loan Bank advances	14,377	9,992	7,746
Junior subordinated debentures	613	491	871
Other interest expense	1	5	9
Total interest expense	30,055	22,992	21,768
Net interest income	119,531	110,478	103,982
Provision for loan losses	2,600	5,650	1,050
Net interest income after provision for loan losses	116,931	104,828	102,932
Noninterest income:
Wealth management revenues	39,346	37,569	35,416
Mortgage banking revenues	11,392	13,183	9,901
Service charges on deposit accounts	3,672	3,702	3,865
Card interchange fees	3,502	3,385	3,199
Loan related derivative income	3,214	3,243	2,441
Income from bank-owned life insurance	2,161	2,659	1,982
Other income	1,522	1,388	1,536
Total noninterest income	64,809	65,129	58,340
Noninterest expense:
Salaries and employee benefits	68,487	67,221	63,024
Net occupancy	7,521	7,151	7,000
Outsourced services	6,920	5,222	5,111
Equipment	5,358	6,208	5,533
Legal, audit and professional fees	2,294	2,579	2,741
FDIC deposit insurance costs	1,647	1,878	1,846
Advertising and promotion	1,481	1,458	1,526
Amortization of intangibles	1,035	1,284	904
Debt prepayment penalties	0	431	0
Acquisition related expenses	0	0	989
Change in fair value of contingent consideration	(643)	(898)	41
Other expenses	10,000	8,569	8,214
Total noninterest expense	104,100	101,103	96,929
Income before income taxes	77,640	68,854	64,343
Income tax expense	31,715	22,373	20,878
Net income	$ 45,925	$ 46,481	$ 43,465
Weighted average common shares outstanding - basic	17,207	17,081	16,879
Weighted average common shares outstanding - diluted	17,338	17,208	17,067
Per share information:
Basic earnings per common share (in dollars per share)	$ 2.66	$ 2.72	$ 2.57
Diluted earnings per common share (in dollars per share)	2.64	2.70	2.54
Cash dividends declared per share (in dollars per share)	$ 1.54	$ 1.46	$ 1.36