Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 9,112,000	$ 6,862,000
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Provision for loan losses	865,000	960,000
Depreciation	825,000	818,000
Deferred income tax provision	499,000	252,000
Amortization of intangibles	255,000	278,000
Valuation adjustments on repossessed real estate and other assets		51,000
Net realized gains on debt securities	(6,000)	(6,000)
Net gains on sales of assets	(130,000)	(364,000)
Earnings on bank-owned life insurance	(451,000)	(326,000)
Amortization of premiums on securities	291,000	313,000
Stock-based compensation expense	392,000	9,000
Change in operating assets and liabilities:
Loans held for sale	1,464,000	40,000
Other assets	2,312,000	564,000
Other liabilities	(7,726,000)	1,377,000
Total adjustments	(1,410,000)	3,966,000
Net cash provided by operating activities	7,702,000	10,828,000
Cash flows from investing activities:
Purchases of debt securities	(85,675,000)	(99,387,000)
Proceeds from sales, calls and maturities of debt securities	78,890,000	79,628,000
Principal repayments of debt securities	4,861,000	4,760,000
Net (contributions to) dividends from equity investments	(449,000)	79,000
Net increase in loans	(45,514,000)	(69,318,000)
Sales of loan participations	7,500,000	5,934,000
Purchases of loan participations	(7,000,000)	(205,000)
Sales of U.S. Small Business Administration loans	237,000	568,000
Purchase of bank-owned life insurance	(1,700,000)
Proceeds from sales of repossessed real estate and other assets	393,000	1,668,000
Purchases of premises and equipment	(354,000)	(479,000)
Proceeds from sales of premises and equipment		580,000
Net cash used in investing activities	(48,811,000)	(76,172,000)
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposits	10,732,000	(31,586,000)
Net decrease in interest-bearing deposits	(14,002,000)	(10,729,000)
Net increase (decrease) in securities sold under agreements to repurchase	(664,000)	121,000
Repayments of note payable		(1,107,000)
Dividends paid on common stock	(1,241,000)	(1,103,000)
Net cash used in financing activities	(5,175,000)	(44,404,000)
Net decrease in cash, cash equivalents and restricted cash	(46,284,000)	(109,748,000)
Cash, cash equivalents and restricted cash, beginning	326,199,000	382,103,000
Cash, cash equivalents and restricted cash, ending	$ 279,915,000	$ 272,355,000