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Securities - Maturity of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 1,367 $ 1,561
Amortized cost, After one year but within five years 1,037 1,937
Amortized cost, After five years but within ten years 655 707
Amortized cost, After ten years 9 160
Amortized Cost 3,068 4,365
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 113,844 66,542
Amortized Cost, After one year but within five years 261,600 320,150
Amortized Cost, After five years but within ten years 6,257 5,830
Amortized Cost, After ten years 58,622 66,199
Total debt securities 440,323 458,721
Amortized Cost, Equity securities 6,351 6,594
Amortized Cost 446,674 465,315
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 1,374 1,568
Estimated Fair Value, After one year but within five years 1,048 1,951
Estimated Fair Value, After five years but within ten years 666 723
Estimated Fair Value, After ten years 10 161
Estimated Fair Value 3,098 4,403
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 113,717 66,662
Estimated Fair Value, After one year but within five years 262,299 319,839
Estimated Fair Value, After five years but within ten years 6,616 6,152
Estimated Fair Value, After ten years 58,454 66,246
Total debt securities 441,086 458,899
Estimated Fair Value, Equity securities 5,855 6,569
Estimated Fair Value, Total $ 446,941 $ 465,468