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Securities - Maturity of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 1,308 $ 1,451
Amortized cost, After one year but within five years 6,244 6,603
Amortized cost, After five years but within ten years 237 380
Amortized cost, After ten years 134 159
Amortized Cost 7,923 8,593
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 166,121 41,772
Amortized Cost, After one year but within five years 256,716 350,975
Amortized Cost, After five years but within ten years 15,810 21,990
Amortized Cost, After ten years 80,657 87,252
Total debt securities 519,304 501,989
Amortized Cost, Equity securities 6,093 7,364
Amortized Cost 525,397 509,353
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 1,317 1,456
Estimated Fair Value, After one year but within five years 6,277 6,642
Estimated Fair Value, After five years but within ten years 249 396
Estimated Fair Value, After ten years 148 177
Estimated Fair Value 7,991 8,671
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 166,327 41,870
Estimated Fair Value, After one year but within five years 259,037 352,044
Estimated Fair Value, After five years but within ten years 16,491 22,717
Estimated Fair Value, After ten years 81,449 88,132
Total debt securities 523,304 504,763
Estimated Fair Value, Equity securities 6,092 11,427
Estimated Fair Value, Total $ 529,396 $ 516,190