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Securities - Fair Value of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 514,839 | $ 508,427
Gross Unrealized Gains | 10,476 | 9,015
Held-to-maturity, Amortized Cost | 9,910 | 9,910
Gross Unrealized Losses | (5,885) | (8,851)
Available-for-sale Securities, Fair Value | 519,430 | 508,591
Held-to-maturity, Fair Value | 9,910 | 9,910
U.S. Treasury and federal agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 43,098 | 43,808
Gross Unrealized Gains | 121 | 133
Gross Unrealized Losses | (578) | (807)
Available-for-sale Securities, Fair Value | 42,641 | 43,134
State and municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 174,538 | 176,670
Gross Unrealized Gains | 5,623 | 4,405
Held-to-maturity, Amortized Cost | 9,910 | 9,910
Gross Unrealized Losses | (1,828) | (3,177)
Held-to-maturity, Gross Unrealized Gains |  |
Available-for-sale Securities, Fair Value | 178,333 | 177,898
Held-to-maturity, Gross Unrealized Losses |  |
Held-to-maturity, Fair Value | 9,910 | 9,910
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 115,584 | 116,047
Gross Unrealized Gains | 1,126 | 1,242
Gross Unrealized Losses | (1,874) | (2,583)
Available-for-sale Securities, Fair Value | 114,836 | 114,706
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 179,625 | 170,006
Gross Unrealized Gains | 3,553 | 3,172
Gross Unrealized Losses | (1,605) | (2,284)
Available-for-sale Securities, Fair Value | 181,573 | 170,894
Private labeled mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,024 | 1,188
Gross Unrealized Gains | 32 | 38
Gross Unrealized Losses |  |
Available-for-sale Securities, Fair Value | 1,056 | 1,226
Corporate notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 970 | 708
Gross Unrealized Gains | 21 | 25
Gross Unrealized Losses |  |
Available-for-sale Securities, Fair Value | $ 991 | $ 733

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