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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Contractual maturity of debt securities    
Amortized cost, Total $ 16,416 $ 22,477
Available for Sale    
Estimated Fair Value, Total 546,126 592,500
Held for Investment [Member] | Fair Value [Member]
    
Contractual maturity of debt securities    
Estimated Fair Value, Within one year 4,227 5,908
Estimated Fair Value, After one year but within five years 10,496 14,256
Estimated Fair Value, After five years but within ten years 1,438 1,943
Estimated Fair Value, After ten years 528 851
Estimated Fair Value Total 16,689 22,958
Held for Investment [Member] | Amortized Cost [Member]
    
Contractual maturity of debt securities    
Amortized cost, Within one year 4,180 5,845
Amortized cost, After one year but within five years 10,360 13,967
Amortized cost, After five years but within ten years 1,400 1,883
Amortized cost, After ten years 476 782
Amortized cost, Total 16,416 22,477
Available for Sale [Member] | Fair Value [Member]
    
Available for Sale    
Estimated Fair Value, Within one year 145,027 107,109
Estimated Fair Value, After one year but within five years 259,475 321,661
Estimated Fair Value, After five years but within ten years 38,306 63,358
Estimated Fair Value, After ten years 93,293 88,210
Total debt securities 536,101 580,338
Estimated Fair Value, Equity securities 10,025 12,162
Estimated Fair Value, Total 546,126 592,500
Available for Sale [Member] | Amortized Cost [Member]
    
Available for Sale    
Amortized Cost, Within one year 144,666 105,169
Amortized Cost, After one year but within five years 256,890 317,979
Amortized Cost, After five years but within ten years 36,764 61,412
Amortized Cost, After ten years 90,626 86,149
Amortized Cost, Equity securities 7,463 7,222
Amortized Cost, Total 536,409 577,931
Total debt securities $ 528,946 $ 570,709