Consolidated Statements Of Cash Flows	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Operating Activities
Net income	$ 20,952,000	$ 24,570,000	$ 22,783,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,936,000	2,220,000	2,028,000
Depreciation and amortization expense	3,614,000	3,051,000	3,004,000
Investment securities amortization and accretion, net	2,244,000	1,784,000	2,166,000
Stock-based compensation expense	836,000	599,000	596,000
Amortization of intangible assets	1,306,000	1,148,000	1,150,000
Net gains on sale of securities	(4,000)	(451,000)	(785,000)
Net increase in other real estate owned valuation allowance and loss on disposition	362,000	215,000	130,000
Originations of mortgage loans held for sale	(72,032,000)	(799,000)	(33,254,000)
Proceeds from the sale of mortgage loans	62,485,000	830,000	33,982,000
Gain on sale of mortgage loans	(1,278,000)	(31,000)	(728,000)
Cost of fixed assets disposals associated with the SBM acquisition	1,130,000	0	0
Gain on branch divestiture	0	0	(2,742,000)
Goodwill impairment	0	0	2,830,000
(Increase) decrease in other assets	(7,062,000)	(3,349,000)	5,000
Increase (decrease) in other liabilities	1,429,000	99,000	(1,433,000)
Net cash provided by operating activities	15,918,000	29,886,000	29,732,000
Investing Activities
Cash received in SBM acquisition, net of cash paid	59,917,000	0	0
Net cash settlement in branch divestiture	0	0	(39,648,000)
Proceeds from sales and maturities of available-for-sale securities	156,434,000	134,358,000	147,373,000
Purchase of available-for-sale securities	(111,170,000)	(78,355,000)	(208,344,000)
Purchase of securities held-to-maturity	(64,355,000)	(20,338,000)	0
Net increase in loans	(94,811,000)	(196,670,000)	(67,826,000)
Purchase of premises and equipment	(3,189,000)	(1,316,000)	(1,490,000)
Purchase of Federal Home Loan Bank and Federal Reserve Bank stock	(1,594,000)	(718,000)	0
Proceeds from sale of other real estate owned	471,000	51,000	1,310,000
Proceeds from sale of other real estate owned	2,825,000	1,730,000	946,000
Recoveries of previously charged-off loans	728,000	746,000	768,000
Purchase of bank-owned life insurance	0	(10,000,000)	0
Net cash used in investing activities	(54,744,000)	(170,512,000)	(166,911,000)
Financing Activities
Net increase (decrease) in deposits	71,825,000	118,435,000	(29,380,000)
Repayments on Federal Home Loan Bank long-term advances	(11,039,000)	(60,073,000)	(289,000)
Proceeds from Federal Home Loan Bank long-term advances	10,000,000	60,000,000	0
Issuance of subordinated debt, net of costs	14,464,000	0	0
Net increase (decrease) in other borrowed funds	(18,105,000)	46,954,000	170,194,000
Common stock repurchases	0	(7,475,000)	(2,460,000)
Equity issuance costs	(612,000)	0	0
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(753,000)	(328,000)	(300,000)
Cash dividends paid on common stock	(9,785,000)	(8,085,000)	(8,121,000)
Net cash provided by financing activities	57,501,000	150,084,000	130,244,000
Net increase (decrease) in cash and cash equivalents	18,675,000	9,458,000	(6,935,000)
Cash and cash equivalents at beginning of year	60,813,000	51,355,000	58,290,000
Cash and cash equivalents at end of year	79,488,000	60,813,000	51,355,000
Supplemental information
Interest paid	12,588,000	12,158,000	13,014,000
Income taxes paid	12,205,000	13,365,000	10,640,000
Transfer of loans and premises to other real estate owned	2,175,000	1,337,000	1,958,000
Common stock repurchased not yet settled	0	0	320,000
Assets acquired in SBM acquisition, excluding net cash received	729,283,000	0	0
Liabilities assumed in SBM acquisition	729,500,000	0	0
Common stock and stock options issued for SBM acquisition	$ 110,551,000	$ 0	$ 0