Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 32,135	$ 14,216
Available-for-sale investment securities:
Purchases	(65,889)	(64,105)
Proceeds from sales	30,590	47,567
Proceeds from principal payments, calls and prepayments	60,112	59,875
Held-to-maturity investment securities:
Proceeds from principal payments	1,208	762
Net increase in loans	(54,247)	(4,653)
Net expenditures for premises and equipment	(3,785)	(5,107)
Proceeds from sales of other real estate owned	141	191
Investment in bank owned life insurance	(35,000)	0
Business acquisitions, net of cash received	(244)	98,147
Investment in limited partnership and tax credit funds	2,878	108
Net cash (used in) provided by investing activities	(69,992)	132,569
Financing activities:
Net (decrease) increase in non-interest-bearing deposits	(18,244)	62,759
Net increase (decrease) in interest-bearing deposits	15,332	(80,493)
Net increase in short-term borrowings	13,126	4,434
Proceeds from long-term borrowings	55,000	0
Payments on long-term borrowings	(21,429)	(57,362)
Cash dividends paid	(5,423)	(4,785)
Purchase of treasury stock under share repurchase program	(4,965)	0
Repurchase of common shares in connection with employee incentive and director compensation plans to be held as treasury stock	316	593
Proceeds from issuance of common shares	8	0
Excess tax (expense) benefit from share-based payment awards	(3)	63
Net cash provided by (used in) financing activities	33,086	(75,977)
Net (decrease) increase in cash and cash equivalents	(4,771)	70,808
Cash and cash equivalents at beginning of period	71,115	61,454
Cash and cash equivalents at end of period	$ 66,344	$ 132,262