Quarterly report [Sections 13 or 15(d)]

Securities - Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded (Detail)

v3.25.1
Securities - Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded (Detail)
$ in Thousands
Mar. 31, 2025
USD ($)
Security
Dec. 31, 2024
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (399) $ (1,447)
Available-for-Sale Within One Year, Estimated Fair Value $ 52,090 $ 144,646
Available-for-Sale Within One Year, Number of Securities | Security 17 42
Available-for-Sale More than One Year, Gross Unrealized Loss $ (85,951) $ (98,219)
Available-for-Sale More than One Year, Estimated Fair Value $ 615,067 $ 630,005
Available-for-Sale More than One Year, Number of Securities | Security 192 195
Available-for-Sale, Gross Unrealized Loss $ (86,350) $ (99,666)
Available-for-Sale, Estimated Fair Value $ 667,157 $ 774,651
Available-for-Sale, Number of Securities | Security 209 237
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (17) $ (61)
Available-for-Sale Within One Year, Estimated Fair Value $ 8,063 $ 13,603
Available-for-Sale Within One Year, Number of Securities | Security 3 6
Available-for-Sale More than One Year, Gross Unrealized Loss $ (359) $ (460)
Available-for-Sale More than One Year, Estimated Fair Value $ 9,876 $ 9,771
Available-for-Sale More than One Year, Number of Securities | Security 3 3
Available-for-Sale, Gross Unrealized Loss $ (376) $ (521)
Available-for-Sale, Estimated Fair Value $ 17,939 $ 23,374
Available-for-Sale, Number of Securities | Security 6 9
Mortgage-backed securities - residential    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (102) $ (271)
Available-for-Sale Within One Year, Estimated Fair Value $ 8,788 $ 23,276
Available-for-Sale Within One Year, Number of Securities | Security 5 10
Available-for-Sale More than One Year, Gross Unrealized Loss $ (51,899) $ (61,372)
Available-for-Sale More than One Year, Estimated Fair Value $ 348,252 $ 351,793
Available-for-Sale More than One Year, Number of Securities | Security 114 114
Available-for-Sale, Gross Unrealized Loss $ (52,001) $ (61,643)
Available-for-Sale, Estimated Fair Value $ 357,040 $ 375,069
Available-for-Sale, Number of Securities | Security 119 124
Mortgage-backed securities - commercial    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (246) $ (447)
Available-for-Sale Within One Year, Estimated Fair Value 14,745 $ 19,092
Available-for-Sale Within One Year, Number of Securities | Security   5
Available-for-Sale More than One Year, Gross Unrealized Loss (11,785) $ (12,608)
Available-for-Sale More than One Year, Estimated Fair Value $ 41,463 $ 41,817
Available-for-Sale More than One Year, Number of Securities | Security 14 14
Available-for-Sale, Gross Unrealized Loss $ (12,031) $ (13,055)
Available-for-Sale, Estimated Fair Value $ 56,208 $ 60,909
Available-for-Sale, Number of Securities | Security 18 19
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (34) $ (645)
Available-for-Sale Within One Year, Estimated Fair Value $ 20,494 $ 76,963
Available-for-Sale Within One Year, Number of Securities | Security 5 18
Available-for-Sale More than One Year, Gross Unrealized Loss $ (7,749) $ (8,756)
Available-for-Sale More than One Year, Estimated Fair Value $ 52,260 $ 54,020
Available-for-Sale More than One Year, Number of Securities | Security 23 24
Available-for-Sale, Gross Unrealized Loss $ (7,783) $ (9,401)
Available-for-Sale, Estimated Fair Value $ 72,754 $ 130,983
Available-for-Sale, Number of Securities | Security 28 42
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss   $ (23)
Available-for-Sale Within One Year, Estimated Fair Value   $ 11,712
Available-for-Sale Within One Year, Number of Securities | Security   3
Available-for-Sale More than One Year, Gross Unrealized Loss $ (2,891) $ (3,946)
Available-for-Sale More than One Year, Estimated Fair Value $ 98,658 $ 107,595
Available-for-Sale More than One Year, Number of Securities | Security 19 21
Available-for-Sale, Gross Unrealized Loss $ (2,891) $ (3,969)
Available-for-Sale, Estimated Fair Value $ 98,658 $ 119,307
Available-for-Sale, Number of Securities | Security 19 24
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (382) $ (1,386)
Available-for-Sale Within One Year, Estimated Fair Value $ 44,027 $ 131,043
Available-for-Sale Within One Year, Number of Securities | Security 14 36
Available-for-Sale More than One Year, Gross Unrealized Loss $ (74,324) $ (86,682)
Available-for-Sale More than One Year, Estimated Fair Value $ 540,633 $ 555,225
Available-for-Sale More than One Year, Number of Securities | Security 170 173
Available-for-Sale, Gross Unrealized Loss $ (74,706) $ (88,068)
Available-for-Sale, Estimated Fair Value $ 584,660 $ 686,268
Available-for-Sale, Number of Securities | Security 184 209
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale More than One Year, Gross Unrealized Loss $ (11,268) $ (11,077)
Available-for-Sale More than One Year, Estimated Fair Value $ 64,558 $ 65,009
Available-for-Sale More than One Year, Number of Securities | Security 19 19
Available-for-Sale, Gross Unrealized Loss $ (11,268) $ (11,077)
Available-for-Sale, Estimated Fair Value $ 64,558 $ 65,009
Available-for-Sale, Number of Securities | Security 19 19