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Available for Sale Debt Securities - Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost $ 1,073,570 $ 965,135
Gross unrealized gains 32,890 12,932
Gross unrealized losses (971) (1,148)
Fair value 1,105,489 976,919
Agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost 1,001  
Gross unrealized gains 8  
Gross unrealized losses 0  
Fair value 1,009  
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost 910,393 936,196
Gross unrealized gains 28,872 12,367
Gross unrealized losses (852) (1,133)
Fair value 938,413 947,430
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost 52,295  
Gross unrealized gains 1,535  
Gross unrealized losses  
Fair value 53,830  
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost 69,687 3,907
Gross unrealized gains 1,666 172
Gross unrealized losses (95) 0
Fair value 71,258 4,079
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale, amortized cost 40,194 25,032
Gross unrealized gains 809 393
Gross unrealized losses (24) (15)
Fair value $ 40,979 $ 25,410