Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 14,958,000	$ 15,983,000
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	5,352,000	4,275,000
Accretion of acquired loans	(1,019,000)	(2,251,000)
Provision for loan losses	1,350,000	1,700,000
Stock-based compensation expense	935,000	616,000
Stock grants to directors for retainer fee	363,000	327,000
Proceeds from sales of mortgage loans held for sale	48,904,000	46,441,000
Origination of mortgage loans held for sale	(47,993,000)	(46,715,000)
Net gain from sales of mortgage loans held for sale	(1,744,000)	(1,290,000)
Gain on trust preferred securities repurchase	0	(2,970,000)
Net gain from sales and valuation write-down of foreclosed assets	(102,000)	(322,000)
Net (gain) loss from sales and valuation write-down of former bank premises	123,000	(10,000)
Net loss from sales of fixed assets	57,000	171,000
Net (gain) loss from sales of available for sale securities	(16,000)	1,000
Earnings on bank owned life insurance	(2,066,000)	(584,000)
Net change in:
Accrued interest receivable	(279,000)	568,000
Other assets	(1,971,000)	(120,000)
Accrued interest and other liabilities	(1,153,000)	(13,000)
Net cash from operating activities	15,699,000	15,807,000
Cash flows from investing activities
Loan originations and payments, net	(148,384,000)	(99,276,000)
Purchases of securities available for sale	(24,072,000)	(60,873,000)
Proceeds from maturities, calls and repayments of securities available for sale	35,357,000	86,872,000
Proceeds from sales of securities available for sale	894,000	264,000
Proceeds from sales of foreclosed assets	295,000	1,371,000
Proceeds from sales of former bank premises	22,000	46,000
Purchases of Federal Home Loan Bank stock	(3,010,000)	(459,000)
Proceeds from bank owned life insurance cash value release and death benefits	2,720,000	0
Purchases of bank owned life insurance	0	(7,000,000)
Net purchases of premises and equipment	(2,161,000)	(307,000)
Net cash for investing activities	(138,339,000)	(79,362,000)
Cash flows from financing activities
Net decrease in time deposits	(65,844,000)	(17,540,000)
Net increase in all other deposits	61,580,000	21,876,000
Net decrease in securities sold under agreements to repurchase	(20,790,000)	(18,081,000)
Maturities of Federal Home Loan Bank advances	(20,000,000)	0
Proceeds from Federal Home Loan Bank advances	90,000,000	110,000,000
Proceeds from stock option exercises	248,000	379,000
Employee stock purchase plan	23,000	18,000
Dividend reinvestment plan	1,286,000	909,000
Repurchase of common stock shares	0	(3,732,000)
Repurchase of trust preferred securities	0	(8,030,000)
Payment of cash dividends to common shareholders	(5,850,000)	(5,152,000)
Net cash from financing activities	40,653,000	80,647,000
Net change in cash and cash equivalents	(81,987,000)	17,092,000
Cash and cash equivalents at beginning of period	183,596,000	89,891,000
Cash and cash equivalents at end of period	101,609,000	106,983,000
Supplemental disclosures of cash flows information
Interest	7,082,000	6,016,000
Federal income tax	7,525,000	6,700,000
Noncash financing and investing activities:
Transfers from loans to foreclosed assets	559,000	236,000
Transfers from bank premises to other real estate owned	$ 99,000	$ 371,000