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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost within one year $ 7,123 $ 7,192
Amortized cost one to five years 46,104 38,197
Amortized cost for five to ten years 11,351 16,807
Amortized cost for after ten years 14,799 17,605
Total amortized cost 79,377 79,801
Total available for sale investment securities, Amortized Cost 446,558 444,062
Within one year, amortized cost 0 0
One to five years, amortized cost 20,415 17,815
Five to ten years, amortized cost 88,183 106,167
After ten years, amortized cost 34,495 28,208
Total amortized cost 143,093 152,190
Total held to maturity investment securities, amortized cost 173,696 187,629
Fair value within one year 7,153 7,232
Fair value for one to five years 46,664 38,894
Fair value for five to ten years 11,804 17,152
Fair value for after ten years 15,532 17,797
Total fair value 81,153 81,075
Investment securities, available for sale 455,239 444,982
Within one year, fair value 0 0
One to five years, fair value 20,436 18,403
five to ten years, fair value 92,551 110,026
After ten years, fair value 35,086 28,976
Total fair value 148,073 157,405
Held-to-maturity, Fair Value 180,059 193,703
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 151,736 157,291
Total held to maturity investment securities, amortized cost 8,424 9,051
Investment securities, available for sale 154,263 156,203
Held-to-maturity, Fair Value 8,623 8,954
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 215,445 206,970
Total held to maturity investment securities, amortized cost 22,179 26,388
Investment securities, available for sale 219,823 207,704
Held-to-maturity, Fair Value $ 23,363 $ 27,344