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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost within one year $ 7,455 $ 7,192
Amortized cost one to five years 37,483 38,197
Amortized cost for five to ten years 21,112 16,807
Amortized cost for after ten years 60,566 17,605
Total amortized cost 126,616 79,801
Total available for sale investment securities, Amortized Cost 445,839 444,062
Within one year, amortized cost 0 0
One to five years, amortized cost 24,594 17,815
Five to ten years, amortized cost 87,645 106,167
After ten years, amortized cost 53,368 28,208
Total amortized cost 165,607 152,190
Total held to maturity investment securities, amortized cost 193,194 187,629
Fair value within one year 7,480 7,232
Fair value for one to five years 37,479 38,894
Fair value for five to ten years 20,984 17,152
Fair value for after ten years 59,967 17,797
Total fair value 125,910 81,075
Investment securities, available for sale 439,831 444,982
Within one year, fair value 0 0
One to five years, fair value 25,271 18,403
five to ten years, fair value 88,805 110,026
After ten years, fair value 51,746 28,976
Total fair value 165,822 157,405
Held-to-maturity, Fair Value 194,086 193,703
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 139,040 157,291
Total held to maturity investment securities, amortized cost 6,530 9,051
Investment securities, available for sale 137,195 156,203
Held-to-maturity, Fair Value 6,490 8,954
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 180,183 206,970
Total held to maturity investment securities, amortized cost 21,057 26,388
Investment securities, available for sale 176,726 207,704
Held-to-maturity, Fair Value $ 21,774 $ 27,344