CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 16,347,000	$ 10,767,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,565,000	1,531,000
Net amortization of securities	2,089,000	2,760,000
Deferred tax benefit	0	(237,000)
Change in unamortized net loan costs and premiums	214,000	(148,000)
Premises and equipment depreciation and amortization expense	1,676,000	1,827,000
Stock-based compensation expense	627,000	556,000
Accretion of purchase accounting entries, net	(1,240,000)	(1,594,000)
Amortization of other intangibles	414,000	391,000
Income from cash surrender value of bank-owned life insurance policies	(823,000)	(785,000)
Loss on premises and equipment, net	0	95,000
Net change in other assets and liabilities	(5,695,000)	(4,919,000)
Net cash provided by operating activities	15,174,000	10,244,000
Cash flows from investing activities:
Proceeds from maturities, calls and prepayments of securities available for sale	48,942,000	61,299,000
Purchases of securities available for sale	(57,725,000)	(104,833,000)
Net change in loans	10,924,000	(20,056,000)
Purchase of loans	(10,231,000)	(18,621,000)
Purchase of Federal Home Loan Bank stock	(848,000)	(7,388,000)
Proceeds from sale of Federal Home Loan Bank stock	241,000	0
Purchase of premises and equipment, net	(2,002,000)	(2,413,000)
Acquisitions, net of cash (paid) acquired	0	39,537,000
Proceeds from sale of other real estate	94,000	322,000
Net cash used in investing activities	(10,605,000)	(52,153,000)
Cash flows from financing activities:
Net increase in deposits	22,558,000	12,419,000
Net change in short-term advances from the Federal Home Loan Bank	(47,467,000)	228,833,000
Net change in long-term advances from the Federal Home Loan Bank	(3,297,000)	(77,554,000)
Net change in securities sold repurchase agreements	0	(5,754,000)
Exercise of stock options	604,000	263,000
Purchase of treasury stock	(278,000)	0
Common stock cash dividends paid	(5,981,000)	(5,744,000)
Net cash (used in) provided by financing activities	(33,861,000)	152,463,000
Net change in cash and cash equivalents	(29,292,000)	110,554,000
Cash and cash equivalents at beginning of year	90,685,000	8,439,000
Cash and cash equivalents at end of period	61,393,000	118,993,000
Supplemental cash flow information:
Interest paid	17,182,000	10,698,000
Income taxes paid, net	6,218,000	3,084,000
Acquisition of non-cash assets and liabilities:
Assets acquired	0	1,454,076
Liabilities assumed	0	1,406,672
Other non-cash changes:
Real estate owned acquired in settlement of loans	$ 124,000	$ 32,000