Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 10,941,000	$ 16,684,000	$ 17,574,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	18,503,000	13,174,000	16,110,000
Provision for (recovery of) loan losses	14,097,000	339,000	(4,410,000)
Bank owned life insurance income	(598,000)	(106,000)	(56,000)
Net gain on investment securities	(729,000)	(398,000)	(489,000)
Loss (gain) on debt extinguishment	520,000	(67,000)	0
Loans originated for sale	(53,570,000)	(51,458,000)	(68,323,000)
Proceeds from sales of loans	56,532,000	49,218,000	74,049,000
Net gains on sales of loans	(1,005,000)	(943,000)	(1,544,000)
Deferred income tax (benefit) expense	(1,582,000)	3,835,000	4,627,000
Decrease in accrued expenses	(4,412,000)	(631,000)	(13,000)
Decrease in interest receivable	704,000	139,000	313,000
Excess Tax Benefit from Share-based Compensation, Operating Activities	(51,000)	(85,000)	(79,000)
Increase (decrease) in other assets	4,623,000	(1,505,000)	8,058,000
Other, net	3,909,000	3,299,000	(5,353,000)
Net cash provided by operating activities	47,882,000	31,495,000	40,464,000
Available-for-sale investment securities:
Purchases	(196,599,000)	(143,184,000)	(223,979,000)
Proceeds from sales	57,415,000	108,092,000	125,658,000
Proceeds from principal payments, calls and prepayments	126,401,000	79,830,000	99,372,000
Held-to-maturity investment securities:
Purchases	0	(1,017,000)	(5,216,000)
Proceeds from principal payments	2,261,000	1,325,000	885,000
Net increase in loans	(77,893,000)	(76,100,000)	(109,609,000)
Net expenditures for premises and equipment	(9,429,000)	(7,105,000)	(6,604,000)
Proceeds from sales of other real estate owned	971,000	219,000	1,036,000
Proceeds from bank owned life insurance	0	6,322,000	43,100,000
Business combinations, net of cash received	97,277,000	17,081,000	(4,536,000)
(Investment in) return of limited partnership and tax credit funds	(1,514,000)	374,000	(120,000)
Net cash used in investing activities	(1,110,000)	(14,163,000)	(80,013,000)
Financing activities:
Net increase in non-interest-bearing deposits	99,341,000	18,367,000	61,935,000
Net decrease in interest-bearing deposits	(125,360,000)	(26,713,000)	(84,344,000)
Net increase (decrease) in short-term borrowings	72,109,000	(29,373,000)	65,821,000
Proceeds from long-term borrowings	0	5,269,000	0
Payments on long-term borrowings	(72,446,000)	(10,288,000)	(7,025,000)
Cash dividends paid on common shares	(10,065,000)	(6,767,000)	(5,419,000)
Purchase of treasury stock	(741,000)	(520,000)	(228,000)
Proceeds from issuance of common shares	0	40,242,000	8,000
Excess tax benefit from share-based payments	51,000	85,000	79,000
Net cash (used in) provided by financing activities	(37,111,000)	(9,698,000)	30,827,000
Net increase (decrease) in cash and cash equivalents	9,661,000	7,634,000	(8,722,000)
Cash and cash equivalents at beginning of period	61,454,000	53,820,000
Cash and cash equivalents at end of period	71,115,000	61,454,000	53,820,000
Supplemental cash flow information:
Interest paid	11,541,000	10,766,000	11,839,000
Income taxes paid	$ 672,000	$ 6,726,000	$ 7,473,000