Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 19,422	$ 32,123
Available-for-sale investment securities:
Purchases	(109,356)	(206,331)
Proceeds from sales	88,561	121,117
Proceeds from principal payments, calls and prepayments	55,170	82,247
Held-to-maturity investment securities:
Purchases	(1,017)	(5,216)
Proceeds from principal payments	1,022	455
Net increase in loans	(67,963)	(68,729)
Net expenditures for premises and equipment	(5,363)	(4,777)
Proceeds from sales of other real estate owned	204	922
Proceeds from bank owned life insurance contracts	6,322	42,837
Business acquisitions, net of cash received	10,080	(2,248)
Return of (investment in) limited partnership and tax credit funds	358	(120)
Net cash used in investing activities	(21,982)	(39,843)
Financing activities:
Net increase in non-interest-bearing deposits	43,085	39,696
Net decrease in interest-bearing deposits	(15,270)	(94,140)
Net (decrease) increase in short-term borrowings	(45,753)	59,074
Proceeds from long-term borrowings	5,268	0
Payments on long-term borrowings	(7,916)	(4,698)
Cash dividends paid	(4,618)	(4,007)
Purchase of treasury stock	(407)	(166)
Proceeds from issuance of shares	40,242	6
Excess tax benefit from share-based payments	79	73
Net cash provided by (used in) financing activities	14,710	(4,162)
Net increase (decrease) in cash and cash equivalents	12,150	(11,882)
Cash and cash equivalents at beginning of period	53,820	62,542
Cash and cash equivalents at end of period	$ 65,970	$ 50,660