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Securities - Maturity of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]    
Amortized cost, Within one year $ 3,640 $ 4,180
Amortized cost, After one year but within five years 7,277 10,360
Amortized cost, After five years but within ten years 837 1,400
Amortized cost, After ten years 232 476
Amortized cost, Total 11,986 16,416
Amortized Cost, Within one year 208,625 144,666
Amortized Cost, After one year but within five years 167,554 256,890
Amortized Cost, After five years but within ten years 27,195 36,764
Amortized Cost, After ten years 97,542 90,626
Total debt securities 500,916 528,946
Amortized Cost, Equity securities 8,715 7,463
Amortized Cost, Total 509,631 536,409
Estimated Fair Value, Within one year 3,649 4,227
Estimated Fair Value, After one year but within five years 7,321 10,496
Estimated Fair Value, After five years but within ten years 865 1,438
Estimated Fair Value, After ten years 259 528
Estimated Fair Value 12,094 16,689
Estimated Fair Value, Within one year 209,065 145,027
Estimated Fair Value, After one year but within five years 168,210 259,475
Estimated Fair Value, After five years but within ten years 27,797 38,306
Estimated Fair Value, After ten years 98,551 93,293
Total debt securities 503,623 536,101
Estimated Fair Value, Equity securities 12,018 10,025
Estimated Fair Value, Total $ 515,641 $ 546,126