XML 72 R59.htm IDEA: XBRL DOCUMENT v3.8.0.1
Securities - Maturity of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 1,036 $ 1,561
Amortized cost, After one year but within five years 623 1,937
Amortized cost, After five years but within ten years 625 707
Amortized cost, After ten years 8 160
Amortized Cost 2,292 4,365
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 113,225 66,542
Amortized Cost, After one year but within five years 289,038 320,150
Amortized Cost, After five years but within ten years 6,222 5,830
Amortized Cost, After ten years 55,813 66,199
Total debt securities 464,298 458,721
Amortized Cost, Other securities 6,527 6,594
Amortized Cost 470,825 465,315
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 1,034 1,568
Estimated Fair Value, After one year but within five years 627 1,951
Estimated Fair Value, After five years but within ten years 633 723
Estimated Fair Value, After ten years 9 161
Estimated Fair Value 2,303 4,403
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 112,974 66,662
Estimated Fair Value, After one year but within five years 287,058 319,839
Estimated Fair Value, After five years but within ten years 6,500 6,152
Estimated Fair Value, After ten years 55,467 66,246
Total debt securities 461,999 458,899
Estimated Fair Value, Other securities 5,704 6,569
Estimated Fair Value, Total $ 467,703 $ 465,468