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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost within one year $ 8,277 $ 7,455
Amortized cost one to five years 40,343 37,483
Amortized cost for five to ten years 28,390 21,112
Amortized cost for after ten years 64,880 60,566
Total amortized cost 141,890 126,616
Total available for sale investment securities, Amortized Cost 477,670 445,839
Within one year, amortized cost 9,941  
One to five years, amortized cost 30,869 24,594
Five to ten years, amortized cost 86,470 87,645
After ten years, amortized cost 49,351 53,368
Total amortized cost 176,631 165,607
Total held to maturity investment securities, amortized cost 198,868 193,194
Fair value within one year 8,311 7,480
Fair value for one to five years 40,404 37,479
Fair value for five to ten years 28,380 20,984
Fair value for after ten years 65,345 59,967
Total fair value 142,440 125,910
Investment securities, available for sale 474,222 439,831
Within one year, fair value 9,941  
One to five years, fair value 31,892 25,271
five to ten years, fair value 87,885 88,805
After ten years, fair value 48,282 51,746
Total fair value 178,000 165,822
Held-to-maturity, Fair Value 200,482 194,086
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 137,815 139,040
Total held to maturity investment securities, amortized cost 6,297 6,530
Investment securities, available for sale 136,189 137,195
Held-to-maturity, Fair Value 6,262 6,490
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 196,064 180,183
Total held to maturity investment securities, amortized cost 15,940 21,057
Investment securities, available for sale 193,711 176,726
Held-to-maturity, Fair Value 16,220 $ 21,774
Private Labeled Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 1,901  
Investment securities, available for sale $ 1,882