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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Available for Sale  
Amortized Cost, Total $ 540,336
Estimated Fair Value, Total 549,391
Held for Investment [Member]
  
Contractual maturity of debt securities  
Amortized cost, Within one year 4,590
Amortized cost, After one year but within five years 9,898
Amortized cost, After five years but within ten years 1,179
Amortized cost, After ten years 432
Amortized cost, Total 16,099
Estimated Fair Value, Within one year 4,627
Estimated Fair Value, After one year but within five years 9,999
Estimated Fair Value, After five years but within ten years 1,212
Estimated Fair Value, After ten years 479
Estimated Fair Value Total 16,317
Available for Sale [Member]
  
Available for Sale  
Amortized Cost, Within one year 191,802
Amortized Cost, After one year but within five years 219,323
Amortized Cost, After five years but within ten years 34,426
Amortized Cost, After ten years 87,206
Total debt securities 532,757
Amortized Cost, Equity securities 7,579
Amortized Cost, Total 540,336
Estimated Fair Value, Within one year 192,015
Estimated Fair Value, After one year but within five years 221,790
Estimated Fair Value, After five years but within ten years 35,851
Estimated Fair Value, After ten years 89,611
Total debt securities 539,267
Estimated Fair Value, Equity securities 10,124
Estimated Fair Value, Total $ 549,391