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Securities - Fair Value of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 508,427 | $ 463,306
Held-to-maturity, Amortized Cost | 9,910 |
Gross Unrealized Gains | 9,015 | 19,663
Gross Unrealized Losses | (8,851) | (168)
Available-for-sale Securities, Fair Value | 508,591 | 482,801
Held-to-maturity, Fair Value | 9,910 | 0
U.S. Treasury and federal agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 43,808 | 51,458
Gross Unrealized Gains | 133 | 351
Gross Unrealized Losses | (807) | (30)
Available-for-sale Securities, Fair Value | 43,134 | 51,779
State and municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 176,670 | 162,147
Held-to-maturity, Amortized Cost | 9,910 |
Gross Unrealized Gains | 4,405 | 10,842
Held-to-maturity, Gross Unrealized Gains |  |
Gross Unrealized Losses | (3,177) | (84)
Held-to-maturity, Gross Unrealized Losses |  |
Available-for-sale Securities, Fair Value | 177,898 | 172,905
Held-to-maturity, Fair Value | 9,910 |
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 116,047 | 95,337
Gross Unrealized Gains | 1,242 | 1,533
Gross Unrealized Losses | (2,583) | (39)
Available-for-sale Securities, Fair Value | 114,706 | 96,831
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 170,006 | 152,372
Gross Unrealized Gains | 3,172 | 6,847
Gross Unrealized Losses | (2,284) | (15)
Available-for-sale Securities, Fair Value | 170,894 | 159,204
Private labeled mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,188 | 1,960
Gross Unrealized Gains | 38 | 71
Gross Unrealized Losses |  |
Available-for-sale Securities, Fair Value | 1,226 | 2,031
Corporate notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 708 | 32
Gross Unrealized Gains | 25 | 19
Gross Unrealized Losses |  |
Available-for-sale Securities, Fair Value | $ 733 | $ 51

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