Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net income	$ 31,157	$ 10,941	$ 16,684
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	19,169	18,503	13,174
Provision for loan losses	3,539	14,097	339
Bank owned life insurance income	(1,414)	(598)	(106)
Net gain on investment securities	(930)	(729)	(398)
Loss (gain) on debt extinguishment	707	520	(67)
Loans originated for sale	(69,123)	(53,570)	(51,458)
Proceeds from sales of loans	67,421	56,532	49,218
Net gains on sales of loans	(1,047)	(1,005)	(943)
Deferred income tax (benefit) expense	(2,462)	(1,582)	3,835
Increase (decrease) in accrued expenses	3,972	(4,412)	(631)
(Increase) decrease in interest receivable	(1,278)	704	139
Excess Tax Benefit from Share-based Compensation, Operating Activities	(26)	(51)	(85)
Increase (decrease) in other assets	6,974	4,623	(1,505)
Other, net	3,652	3,909	3,299
Net cash provided by operating activities	60,311	47,882	31,495
Available-for-sale investment securities:
Purchases	(166,241)	(196,599)	(143,184)
Proceeds from sales	30,734	57,415	108,092
Proceeds from principal payments, calls and prepayments	127,824	126,401	79,830
Held-to-maturity investment securities:
Purchases	0	0	(1,017)
Proceeds from principal payments	2,167	2,261	1,325
Net increase in loans	(148,951)	(77,893)	(76,100)
Net expenditures for premises and equipment	(5,436)	(9,429)	(7,105)
Proceeds from sales of other real estate owned	240	971	219
Investments from bank owned life insurance	(35,000)	0	0
Proceeds from bank owned life insurance	0	0	6,322
Business combinations, net of cash received	(244)	97,277	17,081
(Investment in) return of limited partnership and tax credit funds	(3,451)	(1,514)	374
Net cash used in investing activities	(198,358)	(1,110)	(14,163)
Financing activities:
Net increase in non-interest-bearing deposits	16,482	99,341	18,367
Net decrease in interest-bearing deposits	(42,655)	(125,360)	(26,713)
Net increase (decrease) in short-term borrowings	145,221	72,109	(29,373)
Proceeds from long-term borrowings	55,000	0	5,269
Payments on long-term borrowings	(24,361)	(72,446)	(10,288)
Cash dividends paid on common shares	(11,173)	(10,065)	(6,767)
Repurchase of common shares in connection with employee incentive and director compensation plans to be held as treasury stock	(4,965)	0	0
Payments for repurchase of common shares in connection with employee incentive and director compensation plans to be held as treasury stock	515	741	520
Proceeds from issuance of common shares	18	0	40,242
Excess tax benefit from share-based payments	26	51	85
Net cash provided by (used in) financing activities	133,078	(37,111)	(9,698)
Net (decrease) increase in cash and cash equivalents	(4,969)	9,661	7,634
Cash and cash equivalents at beginning of period	71,115	61,454	53,820
Cash and cash equivalents at end of period	66,146	71,115	61,454
Supplemental cash flow information:
Interest paid	11,773	11,541	10,766
Income taxes paid	$ 11,890	$ 672	$ 6,726