Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 32,123	$ 22,806
Available-for-sale investment securities:
Purchases	(206,331)	(190,531)
Proceeds from sales	121,117	113,720
Proceeds from principal payments, calls and prepayments	82,247	111,377
Held-to-maturity securities:
Purchases	(5,216)	(23,791)
Proceeds from principle payments	455	7,387
Net (increase) decrease in loans	(68,729)	(20,449)
Net expenditures for premises and equipment	(4,777)	(2,331)
Proceeds from sales of other real estate owned	922	1,387
Proceeds from bank owned life insurance contracts	42,837	0
Business acquisitions, net of cash received	(2,248)	(3,321)
Investment in limited partnership and tax credit funds	(120)	(187)
Net cash provided by (used in) investing activities	(39,843)	(6,739)
Financing activities
Net increase in non-interest-bearing deposits	39,696	34,742
Net increase (decrease) in interest-bearing deposits	(94,140)	27,190
Net (decrease) increase in short-term borrowings	59,074	(13,992)
Payments on long-term borrowings	(4,698)	(39,152)
Repurchase of preferred shares and common stock warrant	0	(1,201)
Cash dividends paid on common shares	(4,007)	(3,265)
Purchase of treasury stock	(166)	(80)
Proceeds from issuance of common shares	6	5
Excess tax benefit from share-based payments	73	13
Net cash provided by (used in) financing activities	(4,162)	4,260
Net increase (decrease) in cash and cash equivalents	(11,882)	20,327
Cash and cash equivalents at beginning of period	62,542	38,950
Cash and cash equivalents at end of period	$ 50,660	$ 59,277