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)

v3.23.1
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, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1,758) $ (4,324)
Available-for-Sale Within One Year, Estimated Fair Value $ 91,619 $ 129,210
Available-for-Sale Within One Year, Number of Securities | Security 37 49
Available-for-Sale More than One Year, Gross Unrealized Loss $ (109,893) $ (120,697)
Available-for-Sale More than One Year, Estimated Fair Value $ 747,911 $ 719,787
Available-for-Sale More than One Year, Number of Securities | Security 194 184
Available-for-Sale, Gross Unrealized Loss $ (111,651) $ (125,021)
Available-for-Sale, Estimated Fair Value $ 839,530 $ 848,997
Available-for-Sale, Number of Securities | Security 231 233
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (186) $ (414)
Available-for-Sale Within One Year, Estimated Fair Value $ 24,606 $ 33,812
Available-for-Sale Within One Year, Number of Securities | Security 11 14
Available-for-Sale More than One Year, Gross Unrealized Loss $ (1,141) $ (1,250)
Available-for-Sale More than One Year, Estimated Fair Value $ 17,823 $ 14,215
Available-for-Sale More than One Year, Number of Securities | Security 5 4
Available-for-Sale, Gross Unrealized Loss $ (1,327) $ (1,664)
Available-for-Sale, Estimated Fair Value $ 42,429 $ 48,027
Available-for-Sale, Number of Securities | Security 16 18
Mortgage-backed securities - residential    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (989) $ (1,712)
Available-for-Sale Within One Year, Estimated Fair Value $ 30,094 $ 36,009
Available-for-Sale Within One Year, Number of Securities | Security 16 18
Available-for-Sale More than One Year, Gross Unrealized Loss $ (67,175) $ (73,789)
Available-for-Sale More than One Year, Estimated Fair Value $ 422,817 $ 424,302
Available-for-Sale More than One Year, Number of Securities | Security 107 105
Available-for-Sale, Gross Unrealized Loss $ (68,164) $ (75,501)
Available-for-Sale, Estimated Fair Value $ 452,911 $ 460,311
Available-for-Sale, Number of Securities | Security 123 123
Mortgage-backed securities - commercial    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (65) $ (84)
Available-for-Sale Within One Year, Estimated Fair Value $ 4,094 $ 4,069
Available-for-Sale Within One Year, Number of Securities | Security 1 1
Available-for-Sale More than One Year, Gross Unrealized Loss $ (10,558) $ (10,423)
Available-for-Sale More than One Year, Estimated Fair Value $ 46,772 $ 47,221
Available-for-Sale More than One Year, Number of Securities | Security 14 14
Available-for-Sale, Gross Unrealized Loss $ (10,623) $ (10,507)
Available-for-Sale, Estimated Fair Value $ 50,866 $ 51,290
Available-for-Sale, Number of Securities | Security 15 15
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (426) $ (1,011)
Available-for-Sale Within One Year, Estimated Fair Value $ 18,991 $ 23,606
Available-for-Sale Within One Year, Number of Securities | Security 5 8
Available-for-Sale More than One Year, Gross Unrealized Loss $ (11,118) $ (11,740)
Available-for-Sale More than One Year, Estimated Fair Value $ 66,075 $ 61,879
Available-for-Sale More than One Year, Number of Securities | Security 23 20
Available-for-Sale, Gross Unrealized Loss $ (11,544) $ (12,751)
Available-for-Sale, Estimated Fair Value $ 85,066 $ 85,485
Available-for-Sale, Number of Securities | Security 28 28
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (92) $ (1,103)
Available-for-Sale Within One Year, Estimated Fair Value $ 13,834 $ 31,714
Available-for-Sale Within One Year, Number of Securities | Security 4 8
Available-for-Sale More than One Year, Gross Unrealized Loss $ (9,902) $ (10,736)
Available-for-Sale More than One Year, Estimated Fair Value $ 126,534 $ 106,785
Available-for-Sale More than One Year, Number of Securities | Security 26 22
Available-for-Sale, Gross Unrealized Loss $ (9,994) $ (11,839)
Available-for-Sale, Estimated Fair Value $ 140,368 $ 138,499
Available-for-Sale, Number of Securities | Security 30 30
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1,572) $ (3,910)
Available-for-Sale Within One Year, Estimated Fair Value $ 67,013 $ 95,398
Available-for-Sale Within One Year, Number of Securities | Security 26 35
Available-for-Sale More than One Year, Gross Unrealized Loss $ (98,753) $ (106,688)
Available-for-Sale More than One Year, Estimated Fair Value $ 662,198 $ 640,187
Available-for-Sale More than One Year, Number of Securities | Security 170 161
Available-for-Sale, Gross Unrealized Loss $ (100,325) $ (110,598)
Available-for-Sale, Estimated Fair Value $ 729,211 $ 735,585
Available-for-Sale, Number of Securities | Security 196 196
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale More than One Year, Gross Unrealized Loss $ (9,999) $ (12,759)
Available-for-Sale More than One Year, Estimated Fair Value $ 67,890 $ 65,385
Available-for-Sale More than One Year, Number of Securities | Security 19 19
Available-for-Sale, Gross Unrealized Loss $ (9,999) $ (12,759)
Available-for-Sale, Estimated Fair Value $ 67,890 $ 65,385
Available-for-Sale, Number of Securities | Security 19 19