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Investment Securities - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 150 $ 569
Within one year, estimated fair value 151 574
After one year through five years, amortized cost 10,355 8,705
After one year through five years, estimated fair value 11,250 9,480
After five years through ten years, amortized cost 20,256 20,553
After five years through ten years, estimated fair value 22,176 22,179
After ten years, amortized cost 120,551 71,352
After ten years, estimated fair value 128,101 76,347
Total securities with single maturity date, amortized cost 151,312 101,179
Total securities with single maturity date, estimated fair value 161,678 108,580
Debt securities, amortized cost 381,074 321,405
Available-for-sale Securities 393,965 328,413
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 9,443 0
Investment securities not due at a single maturity date, estimated fair value 9,454 0
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 206,465 204,222
Investment securities not due at a single maturity date, estimated fair value 208,510 204,544
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 6,258 8,408
Investment securities not due at a single maturity date, estimated fair value 6,375 7,398
Other equity securities
    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,596 7,596
Investment securities not due at a single maturity date, estimated fair value $ 7,948 $ 7,891