Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income:
Loans, including fees	$ 141,086	$ 131,836	$ 103,887
Debt securities:
Taxable	25,397	25,303	14,753
Tax exempt	3,881	1,509	505
Dividends	2,181	2,118	837
Interest bearing cash at Federal Reserve and other banks	1,163	648	1,133
Total interest and dividend income	173,708	161,414	121,115
Interest expense:
Deposits	3,483	3,434	3,274
Other borrowings	9	4	4
Junior subordinated debt	2,229	1,978	1,403
Total interest expense	5,721	5,416	4,681
Net interest income	167,987	155,998	116,434
Benefit from reversal of previously provided loan losses	(5,970)	(2,210)	(4,045)
Net interest income after provision for loan losses	173,957	158,208	120,479
Noninterest income:
Service charges and fees	33,226	32,080	24,236
Gain on sale of loans	4,037	3,064	2,032
Commissions on sale of non-deposit investment products	2,329	3,349	2,995
Increase in cash value of life insurance	2,717	2,786	1,953
Other	2,254	4,068	3,300
Total noninterest income	44,563	45,347	34,516
Noninterest expense:
Salaries and related benefits	80,724	71,405	57,544
Other	65,273	59,436	52,835
Total noninterest expense	145,997	130,841	110,379
Income before income taxes	72,523	72,714	44,616
Provision for income taxes	27,712	28,896	18,508
Net income	$ 44,811	$ 43,818	$ 26,108
Earnings per share:
Basic	$ 1.96	$ 1.93	$ 1.47
Diluted	$ 1.94	$ 1.91	$ 1.46