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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 6,786 | $ 7,192
Amortized cost one to five years | 46,633 | 38,197
Amortized cost for five to ten years | 15,505 | 16,807
Amortized cost for after ten years | 15,724 | 17,605
Total amortized cost | 84,648 | 79,801
Total available for sale investment securities, Amortized Cost | 455,502 | 444,062
Within one year, amortized cost | 0 | 0
One to five years, amortized cost | 15,360 | 17,815
Five to ten years, amortized cost | 98,023 | 106,167
After ten years, amortized cost | 32,137 | 28,208
Total amortized cost | 145,520 | 152,190
Total held to maturity investment securities, amortized cost | 180,291 | 187,629
Fair value within one year | 6,816 | 7,232
Fair value for one to five years | 47,547 | 38,894
Fair value for five to ten years | 16,047 | 17,152
Fair value for after ten years | 16,178 | 17,797
Total fair value | 86,588 | 81,075
Investment securities, available for sale | 462,476 | 444,982
Within one year, fair value | 0 | 0
One to five years, fair value | 16,126 | 18,403
five to ten years, fair value | 102,861 | 110,026
After ten years, fair value | 33,098 | 28,976
Total fair value | 152,085 | 157,405
Held-to-maturity, Fair Value | 188,093 | 193,703
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 155,687 | 157,291
Total held to maturity investment securities, amortized cost | 8,731 | 9,051
Investment securities, available for sale | 157,313 | 156,203
Held-to-maturity, Fair Value | 8,867 | 8,954
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 215,167 | 206,970
Total held to maturity investment securities, amortized cost | 26,040 | 26,388
Investment securities, available for sale | 218,576 | 207,704
Held-to-maturity, Fair Value | $ 27,141 | $ 27,344

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