Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.2
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 955,860 $ 978,796
Gross Unrealized Gain 10 63
Gross Unrealized Loss (119,220) (125,021)
Estimated Fair Value 836,650 853,838
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 58,179 49,690
Gross Unrealized Loss (1,695) (1,664)
Estimated Fair Value 56,484 48,026
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 515,747 540,590
Gross Unrealized Gain 1 63
Gross Unrealized Loss (71,880) (75,501)
Estimated Fair Value 443,868 465,152
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 60,792 61,799
Gross Unrealized Loss (12,014) (10,507)
Estimated Fair Value 48,778 51,292
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 98,122 98,236
Gross Unrealized Gain 9  
Gross Unrealized Loss (11,326) (12,751)
Estimated Fair Value 86,805 85,485
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 145,386 150,338
Gross Unrealized Loss (11,010) (11,839)
Estimated Fair Value 134,376 138,499
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 820,047 850,963
Gross Unrealized Gain 10 63
Gross Unrealized Loss (106,230) (110,598)
Estimated Fair Value 713,827 740,428
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 77,634 78,143
Gross Unrealized Loss (11,295) (12,759)
Estimated Fair Value $ 66,339 $ 65,384