Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 10,757	$ 8,433
Available-for-sale investment securities:
Purchases	(67,397)	(83,594)
Proceeds from sales	69,114	63,651
Proceeds from maturities, calls and prepayments	31,446	34,069
Held-to-maturity securities:
Purchases	(3,231)	(18,348)
Proceeds from principle payments	116	309
Net (increase) decrease in loans	5,607	(5,869)
Net expenditures for premises and equipment	(1,776)	(645)
Proceeds from sales of other real estate owned	16	1,381
Proceeds from bank owned life insurance	1,441	0
Business acquisitions, net of cash received	(1,524)	0
Net cash provided by (used in) investing activities	33,812	(9,046)
Financing activities
Net increase in non-interest-bearing deposits	23,816	28,607
Net increase (decrease) in interest-bearing deposits	12,805	18,839
Net (decrease) increase in short-term borrowings	(15,374)	(6,738)
Payments on long-term borrowings	(1,756)	(38,771)
Repurchase of preferred shares and common stock warrant	0	(1,201)
Cash dividends paid on common shares	(1,201)	(1,086)
Purchase of treasury stock	(31)	(34)
Proceeds from issuance of common shares	1	2
Excess tax benefit from share-based payments	27	0
Net cash provided by (used in) financing activities	18,287	(382)
Net increase (decrease) in cash and cash equivalents	62,856	(995)
Cash and cash equivalents at beginning of period	62,542	38,950
Cash and cash equivalents at end of period	$ 125,398	$ 62,542