Annual report pursuant to Section 13 and 15(d)

Securities - Summary of Investment Securities Available for Sale (Detail)

v3.22.0.1
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 922,654 $ 749,458
Gross Unrealized Gain 177 4,729
Gross Unrealized Loss (12,041) (406)
Estimated Fair Value 910,790 753,781
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 79,152  
Gross Unrealized Gain 117  
Gross Unrealized Loss (881)  
Estimated Fair Value 78,388  
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 15,457 9,997
Gross Unrealized Gain 1 135
Gross Unrealized Loss (61)  
Estimated Fair Value 15,397 10,132
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 615,393 515,169
Gross Unrealized Gain 18 4,260
Gross Unrealized Loss (7,906) (188)
Estimated Fair Value 607,505 519,242
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 95,153 133,632
Gross Unrealized Gain 41 186
Gross Unrealized Loss (1,590) (217)
Estimated Fair Value 93,604 133,601
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 117,499 90,660
Gross Unrealized Gain   148
Gross Unrealized Loss (1,603) (1)
Estimated Fair Value 115,896 90,807
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 828,045 739,461
Gross Unrealized Gain 59 4,594
Gross Unrealized Loss (11,099) (406)
Estimated Fair Value $ 817,005 $ 743,649