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Held to Maturity Debt Securities - Held to Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]      
Amortized cost $ 451,043   $ 453,629
Gross unrealized gains 21,551   14,467
Gross unrealized losses (65)   (130)
Allowance for credit losses (78) $ 70 0
Fair value 472,451   467,966
Investment securities held to maturity 450,965   453,629
Agency obligations      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized cost 7,600   6,599
Gross unrealized gains 6   11
Gross unrealized losses (5)   (9)
Allowance for credit losses 0   0
Fair value 7,601   6,601
Mortgage-backed securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized cost 62   118
Gross unrealized gains 2   4
Gross unrealized losses 0   0
Allowance for credit losses 0   0
Fair value 64   122
Investment securities held to maturity 62    
State and municipal obligations      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized cost 433,655   437,074
Gross unrealized gains 21,442   14,394
Gross unrealized losses (58)   (115)
Allowance for credit losses (66)   0
Fair value 454,973   451,353
Corporate obligations      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized cost 9,726   9,838
Gross unrealized gains 101   58
Gross unrealized losses (2)   (6)
Allowance for credit losses (12)   0
Fair value $ 9,813   $ 9,890