Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Net cash provided by (used in) operating activities	$ 16,826	$ (5,884)
Available-for-sale investment securities:
Purchases	(35,810)	(33,787)
Proceeds from sales	981	42,803
Proceeds from principal payments, calls and prepayments	26,627	21,646
Held-to-maturity investment securities:
Proceeds from principal payments	750	316
Net (increase) decrease in loans	(31,933)	15,384
Net expenditures for premises and equipment	(2,660)	(2,152)
Proceeds from sales of other real estate owned	141	55
Business acquisitions, net of cash received	(244)	103,597
Investment in limited partnership and tax credit funds	(12)	0
Net cash (used in) provided by investing activities	(42,136)	147,862
Financing activities:
Net (decrease) increase in non-interest-bearing deposits	(1,737)	76,533
Net increase (decrease) in interest-bearing deposits	52,905	(57,900)
Net (decrease) increase in short-term borrowings	(25,318)	2,824
Payments on long-term borrowings	(460)	(55,867)
Cash dividends paid	(2,645)	(2,149)
Repurchase of common shares in connection with employee incentive and director compensation plans to be held as treasury stock	(4,965)	0
Excess tax (expense) benefit from share-based payments	(3)	63
Net cash provided by (used in) financing activities	17,491	(37,030)
Net (decrease) increase in cash and cash equivalents	(7,819)	104,948
Cash and cash equivalents at beginning of period	71,115	61,454
Cash and cash equivalents at end of period	63,296	166,402
Repurchase of common shares in connection with employee incentive and director compensation plans to be held as treasury stock	292	534
Proceeds from issuance of common shares	$ 6	$ 0