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Parent Company Only Financial Statements Condensed statements of cash flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]      
Net income $ 14,025 $ 11,372 $ 8,761
Depreciation, amortization and accretion, net 5,403 5,398 3,938
(Increase) decrease in other assets 912 1,900 5,955
Increase (decrease) in other liabilities 1,087 2,061 (4,074)
Net cash provided by operating activities 22,889 18,976 7,508
Repayment of short-term debt (8,250) 0 0
Proceeds from short-term debt 0 8,250 0
Proceeds from issuance of common stock 1,255 406 971
Purchase of treasury stock 3,912 2,385 2,499
Dividends paid on preferred stock (3,788) (2,990) (2,136)
Dividends paid on common stock (2,843) (1,697) (1,714)
Net cash provided by financing activities 60,397 14,081 33,038
Increase (decrease) in cash 9,610 (158,391) 141,082
Cash and cash equivalents at beginning of period 73,102 231,493 90,411
Cash and cash equivalents at end of period 82,712 73,102 231,493
Parent Company [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net income 14,025 11,372 8,761
Depreciation, amortization and accretion, net 114 71 47
Dividends from subsidiaries 1,438 938 6,744
Equity in undistributed earnings of subsidiaries (14,052) (11,803) (3,675)
(Increase) decrease in other assets (1,436) (3,283) (9,966)
Increase (decrease) in other liabilities 319 128 (12)
Net cash provided by operating activities 408 (2,577) 1,899
Repayment of short-term debt (8,250) 0 0
Proceeds from short-term debt 0 8,250 0
Proceeds from issuance of preferred stock 8,250 19,150 0
Proceeds from issuance of common stock 1,255 406 971
Purchase of treasury stock (3,912) (2,385) (2,499)
Dividends paid on preferred stock (3,788) (2,990) (2,136)
Dividends paid on common stock (2,843) (1,697) (1,714)
Net cash provided by financing activities (9,288) 20,734 (5,378)
Increase (decrease) in cash (8,880) 18,157 (3,479)
Cash and cash equivalents at beginning of period 20,538 2,381 5,860
Cash and cash equivalents at end of period $ 11,658 $ 20,538 $ 2,381