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Securities - Maturity of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 4,983 $ 5,168
Amortized cost, After one year but within five years 2,594 2,800
Amortized cost, After five years but within ten years 778 795
Amortized cost, After ten years 24 26
Amortized Cost 8,379 8,789
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 224,616 272,820
Amortized Cost, After one year but within five years 175,071 178,617
Amortized Cost, After five years but within ten years 7,794 8,483
Amortized Cost, After ten years 72,746 75,522
Total debt securities 480,227 535,442
Amortized Cost, Equity securities 6,026 6,228
Amortized Cost 486,253 541,670
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 4,990 5,174
Estimated Fair Value, After one year but within five years 2,617 2,829
Estimated Fair Value, After five years but within ten years 802 319
Estimated Fair Value, After ten years 25 528
Estimated Fair Value 8,434 8,850
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 224,814 272,779
Estimated Fair Value, After one year but within five years 177,377 180,145
Estimated Fair Value, After five years but within ten years 8,359 9,075
Estimated Fair Value, After ten years 73,052 75,853
Total debt securities 483,602 537,852
Estimated Fair Value, Equity securities 6,005 6,308
Estimated Fair Value, Total $ 489,607 $ 544,160