Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income:
Loans, including fees	$ 186,117	$ 146,794	$ 141,086
Investments:
Taxable securities	33,997	27,772	25,397
Tax exempt securities	4,345	4,165	3,881
Dividends	1,705	1,324	2,181
Interest bearing cash at Federal Reserve and other banks	2,054	1,347	1,163
Total interest and dividend income	228,218	181,402	173,708
Interest expense:
Deposits	6,996	3,958	3,483
Other borrowings	2,745	305	9
Junior subordinated debt	3,131	2,535	2,229
Total interest expense	12,872	6,798	5,721
Net interest income	215,346	174,604	167,987
Provision for (benefit from) loan losses	2,583	89	(5,970)
Net interest income after provision for (benefit from) loan losses	212,763	174,515	173,957
Noninterest income:
Service charges and fees	38,460	37,423	33,226
Commissions on sale of non-deposit investment products	3,151	2,729	2,329
Increase in cash value of life insurance	2,718	2,685	2,717
Gain on sale of loans	2,371	3,109	4,037
Gain on sale of investment securities	207	961
Other	2,377	3,114	2,254
Total noninterest income	49,284	50,021	44,563
Noninterest expense:
Salaries and related benefits	93,942	82,930	80,724
Other	74,753	64,094	65,273
Total noninterest expense	168,695	147,024	145,997
Income before income taxes	93,352	77,512	72,523
Provision for income taxes	25,032	36,958	27,712
Net income	$ 68,320	$ 40,554	$ 44,811
Earnings per share:
Basic	$ 2.57	$ 1.77	$ 1.96
Diluted	$ 2.54	$ 1.74	$ 1.94