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)

v3.22.2
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, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (60,732) $ (9,953)
Available-for-Sale Within One Year, Estimated Fair Value $ 611,420 $ 800,439
Available-for-Sale Within One Year, Number of Securities | Security 150 158
Available-for-Sale More than One Year, Gross Unrealized Loss $ (34,431) $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value $ 243,682 $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security 59 15
Available-for-Sale, Gross Unrealized Loss $ (95,163) $ (12,041)
Available-for-Sale, Estimated Fair Value $ 855,102 $ 877,344
Available-for-Sale, Number of Securities | Security 209 173
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1,009) $ (61)
Available-for-Sale Within One Year, Estimated Fair Value $ 22,940 $ 8,391
Available-for-Sale Within One Year, Number of Securities | Security 8 2
Available-for-Sale, Gross Unrealized Loss $ (1,009) $ (61)
Available-for-Sale, Estimated Fair Value $ 22,940 $ 8,391
Available-for-Sale, Number of Securities | Security 8 2
Mortgage-backed securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (40,268) $ (6,252)
Available-for-Sale Within One Year, Estimated Fair Value $ 381,684 $ 535,610
Available-for-Sale Within One Year, Number of Securities | Security 89 102
Available-for-Sale More than One Year, Gross Unrealized Loss $ (23,062) $ (1,654)
Available-for-Sale More than One Year, Estimated Fair Value $ 166,953 $ 59,457
Available-for-Sale More than One Year, Number of Securities | Security 39 11
Available-for-Sale, Gross Unrealized Loss $ (63,330) $ (7,906)
Available-for-Sale, Estimated Fair Value $ 548,637 $ 595,067
Available-for-Sale, Number of Securities | Security 128 113
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (5,762) $ (1,256)
Available-for-Sale Within One Year, Estimated Fair Value $ 71,244 $ 76,894
Available-for-Sale Within One Year, Number of Securities | Security 22 16
Available-for-Sale More than One Year, Gross Unrealized Loss $ (2,822) $ (334)
Available-for-Sale More than One Year, Estimated Fair Value $ 19,485 $ 12,548
Available-for-Sale More than One Year, Number of Securities | Security 6 3
Available-for-Sale, Gross Unrealized Loss $ (8,584) $ (1,590)
Available-for-Sale, Estimated Fair Value $ 90,729 $ 89,442
Available-for-Sale, Number of Securities | Security 28 19
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (6,276) $ (1,503)
Available-for-Sale Within One Year, Estimated Fair Value $ 98,611 $ 110,996
Available-for-Sale Within One Year, Number of Securities | Security 20 21
Available-for-Sale More than One Year, Gross Unrealized Loss $ (2,277) $ (100)
Available-for-Sale More than One Year, Estimated Fair Value $ 29,223 $ 4,900
Available-for-Sale More than One Year, Number of Securities | Security 6 1
Available-for-Sale, Gross Unrealized Loss $ (8,553) $ (1,603)
Available-for-Sale, Estimated Fair Value $ 127,834 $ 115,896
Available-for-Sale, Number of Securities | Security 26 22
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (52,306) $ (9,011)
Available-for-Sale Within One Year, Estimated Fair Value $ 551,539 $ 723,500
Available-for-Sale Within One Year, Number of Securities | Security 131 139
Available-for-Sale More than One Year, Gross Unrealized Loss $ (28,161) $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value $ 215,661 $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security 51 15
Available-for-Sale, Gross Unrealized Loss $ (80,467) $ (11,099)
Available-for-Sale, Estimated Fair Value $ 767,200 $ 800,405
Available-for-Sale, Number of Securities | Security 182 154
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (7,417) $ (881)
Available-for-Sale Within One Year, Estimated Fair Value $ 36,941 $ 68,548
Available-for-Sale Within One Year, Number of Securities | Security 11 17
Available-for-Sale More than One Year, Gross Unrealized Loss $ (6,270)  
Available-for-Sale More than One Year, Estimated Fair Value $ 28,021  
Available-for-Sale More than One Year, Number of Securities | Security 8  
Available-for-Sale, Gross Unrealized Loss $ (13,687) $ (881)
Available-for-Sale, Estimated Fair Value $ 64,962 $ 68,548
Available-for-Sale, Number of Securities | Security 19 17