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Securities - Maturity of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Amortized Cost And Fair Value Debt Securities [Abstract]  
Amortized cost, Within one year $ 3,190
Amortized cost, After one year but within five years 7,240
Amortized cost, After five years but within ten years 639
Amortized cost, After ten years 200
Amortized cost, Total 11,269
Amortized Cost, Within one year 172,145
Amortized Cost, After one year but within five years 267,092
Amortized Cost, After five years but within ten years 27,354
Amortized Cost, After ten years 94,085
Total debt securities 560,676
Amortized Cost, Equity securities 8,647
Amortized Cost, Total 569,323
Estimated Fair Value, Within one year 3,193
Estimated Fair Value, After one year but within five years 7,274
Estimated Fair Value, After five years but within ten years 662
Estimated Fair Value, After ten years 222
Estimated Fair Value 11,351
Estimated Fair Value, Within one year 172,418
Estimated Fair Value, After one year but within five years 267,938
Estimated Fair Value, After five years but within ten years 28,056
Estimated Fair Value, After ten years 95,439
Total debt securities 563,851
Estimated Fair Value, Equity securities 11,898
Estimated Fair Value, Total $ 575,749