Quarterly report pursuant to Section 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)

v3.24.2.u1
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
Jun. 30, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (690) $ (106)
Available-for-Sale Within One Year, Estimated Fair Value $ 121,242 $ 30,422
Available-for-Sale Within One Year, Number of Securities | Security 39 14
Available-for-Sale More than One Year, Gross Unrealized Loss $ (107,300) $ (102,077)
Available-for-Sale More than One Year, Estimated Fair Value $ 710,075 $ 747,988
Available-for-Sale More than One Year, Number of Securities | Security 213 213
Available-for-Sale, Gross Unrealized Loss $ (107,990) $ (102,183)
Available-for-Sale, Estimated Fair Value $ 831,317 $ 778,410
Available-for-Sale, Number of Securities | Security 252 227
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (204) $ (57)
Available-for-Sale Within One Year, Estimated Fair Value $ 53,200 $ 21,024
Available-for-Sale Within One Year, Number of Securities | Security 17 7
Available-for-Sale More than One Year, Gross Unrealized Loss $ (827) $ (983)
Available-for-Sale More than One Year, Estimated Fair Value $ 33,383 $ 32,449
Available-for-Sale More than One Year, Number of Securities | Security 11 11
Available-for-Sale, Gross Unrealized Loss $ (1,031) $ (1,040)
Available-for-Sale, Estimated Fair Value $ 86,583 $ 53,473
Available-for-Sale, Number of Securities | Security 28 18
Mortgage-backed securities - residential    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (223) $ (11)
Available-for-Sale Within One Year, Estimated Fair Value $ 26,217 $ 2,324
Available-for-Sale Within One Year, Number of Securities | Security 11 5
Available-for-Sale More than One Year, Gross Unrealized Loss $ (65,952) $ (62,686)
Available-for-Sale More than One Year, Estimated Fair Value $ 379,731 $ 411,417
Available-for-Sale More than One Year, Number of Securities | Security 117 118
Available-for-Sale, Gross Unrealized Loss $ (66,175) $ (62,697)
Available-for-Sale, Estimated Fair Value $ 405,948 $ 413,741
Available-for-Sale, Number of Securities | Security 128 123
Mortgage-backed securities - commercial    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (4)  
Available-for-Sale Within One Year, Estimated Fair Value $ 4,380  
Available-for-Sale Within One Year, Number of Securities | Security 1  
Available-for-Sale More than One Year, Gross Unrealized Loss $ (12,547) $ (11,982)
Available-for-Sale More than One Year, Estimated Fair Value $ 46,487 $ 47,991
Available-for-Sale More than One Year, Number of Securities | Security 15 15
Available-for-Sale, Gross Unrealized Loss $ (12,551) $ (11,982)
Available-for-Sale, Estimated Fair Value $ 50,867 $ 47,991
Available-for-Sale, Number of Securities | Security 16 15
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (259) $ (38)
Available-for-Sale Within One Year, Estimated Fair Value $ 37,445 $ 7,074
Available-for-Sale Within One Year, Number of Securities | Security 10 2
Available-for-Sale More than One Year, Gross Unrealized Loss $ (9,800) $ (9,611)
Available-for-Sale More than One Year, Estimated Fair Value $ 64,784 $ 63,610
Available-for-Sale More than One Year, Number of Securities | Security 26 24
Available-for-Sale, Gross Unrealized Loss $ (10,059) $ (9,649)
Available-for-Sale, Estimated Fair Value $ 102,229 $ 70,684
Available-for-Sale, Number of Securities | Security 36 26
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale More than One Year, Gross Unrealized Loss $ (6,656) $ (7,590)
Available-for-Sale More than One Year, Estimated Fair Value $ 120,602 $ 124,625
Available-for-Sale More than One Year, Number of Securities | Security 25 26
Available-for-Sale, Gross Unrealized Loss $ (6,656) $ (7,590)
Available-for-Sale, Estimated Fair Value $ 120,602 $ 124,625
Available-for-Sale, Number of Securities | Security 25 26
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (486) $ (49)
Available-for-Sale Within One Year, Estimated Fair Value $ 68,042 $ 9,398
Available-for-Sale Within One Year, Number of Securities | Security 22 7
Available-for-Sale More than One Year, Gross Unrealized Loss $ (94,955) $ (91,869)
Available-for-Sale More than One Year, Estimated Fair Value $ 611,604 $ 647,643
Available-for-Sale More than One Year, Number of Securities | Security 183 183
Available-for-Sale, Gross Unrealized Loss $ (95,441) $ (91,918)
Available-for-Sale, Estimated Fair Value $ 679,646 $ 657,041
Available-for-Sale, Number of Securities | Security 205 190
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale More than One Year, Gross Unrealized Loss $ (11,518) $ (9,225)
Available-for-Sale More than One Year, Estimated Fair Value $ 65,088 $ 67,896
Available-for-Sale More than One Year, Number of Securities | Security 19 19
Available-for-Sale, Gross Unrealized Loss $ (11,518) $ (9,225)
Available-for-Sale, Estimated Fair Value $ 65,088 $ 67,896
Available-for-Sale, Number of Securities | Security 19 19