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Securities - Maturity of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Amortized Cost And Fair Value Debt Securities [Abstract]  
Amortized cost, Within one year $ 1,586
Amortized cost, After one year but within five years 7,013
Amortized cost, After five years but within ten years 656
Amortized cost, After ten years 42
Amortized cost, Total 9,297
Amortized Cost, Within one year 60,097
Amortized Cost, After one year but within five years 367,055
Amortized Cost, After five years but within ten years 25,815
Amortized Cost, After ten years 91,471
Total debt securities 544,438
Amortized Cost, Equity securities 8,706
Amortized Cost, Total 553,144
Estimated Fair Value, Within one year 1,595
Estimated Fair Value, After one year but within five years 7,053
Estimated Fair Value, After five years but within ten years 693
Estimated Fair Value, After ten years 45
Estimated Fair Value 9,386
Estimated Fair Value, Within one year 60,305
Estimated Fair Value, After one year but within five years 368,721
Estimated Fair Value, After five years but within ten years 26,668
Estimated Fair Value, After ten years 92,697
Total debt securities 548,391
Estimated Fair Value, Equity securities 12,741
Estimated Fair Value, Total $ 561,132