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)

v3.22.1
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, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (46,250) $ (9,953)
Available-for-Sale Within One Year, Estimated Fair Value $ 664,426 $ 800,439
Available-for-Sale Within One Year, Number of Securities | Security 149 158
Available-for-Sale More than One Year, Gross Unrealized Loss $ (17,786) $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value $ 211,006 $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security 45 15
Available-for-Sale, Gross Unrealized Loss $ (64,036) $ (12,041)
Available-for-Sale, Estimated Fair Value $ 875,432 $ 877,344
Available-for-Sale, Number of Securities | Security 194 173
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (739) $ (61)
Available-for-Sale Within One Year, Estimated Fair Value $ 18,215 $ 8,391
Available-for-Sale Within One Year, Number of Securities | Security 5 2
Available-for-Sale, Gross Unrealized Loss $ (739) $ (61)
Available-for-Sale, Estimated Fair Value $ 18,215 $ 8,391
Available-for-Sale, Number of Securities | Security 5 2
Mortgage-backed securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (27,111) $ (6,252)
Available-for-Sale Within One Year, Estimated Fair Value $ 409,085 $ 535,610
Available-for-Sale Within One Year, Number of Securities | Security 86 102
Available-for-Sale More than One Year, Gross Unrealized Loss $ (14,477) $ (1,654)
Available-for-Sale More than One Year, Estimated Fair Value $ 167,229 $ 59,457
Available-for-Sale More than One Year, Number of Securities | Security 35 11
Available-for-Sale, Gross Unrealized Loss $ (41,588) $ (7,906)
Available-for-Sale, Estimated Fair Value $ 576,314 $ 595,067
Available-for-Sale, Number of Securities | Security 121 113
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (4,544) $ (1,256)
Available-for-Sale Within One Year, Estimated Fair Value $ 69,210 $ 76,894
Available-for-Sale Within One Year, Number of Securities | Security 19 16
Available-for-Sale More than One Year, Gross Unrealized Loss $ (1,620) $ (334)
Available-for-Sale More than One Year, Estimated Fair Value $ 16,966 $ 12,548
Available-for-Sale More than One Year, Number of Securities | Security 5 3
Available-for-Sale, Gross Unrealized Loss $ (6,164) $ (1,590)
Available-for-Sale, Estimated Fair Value $ 86,176 $ 89,442
Available-for-Sale, Number of Securities | Security 24 19
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (5,057) $ (1,503)
Available-for-Sale Within One Year, Estimated Fair Value $ 97,814 $ 110,996
Available-for-Sale Within One Year, Number of Securities | Security 20 21
Available-for-Sale More than One Year, Gross Unrealized Loss $ (1,689) $ (100)
Available-for-Sale More than One Year, Estimated Fair Value $ 26,811 $ 4,900
Available-for-Sale More than One Year, Number of Securities | Security 5 1
Available-for-Sale, Gross Unrealized Loss $ (6,746) $ (1,603)
Available-for-Sale, Estimated Fair Value $ 124,625 $ 115,896
Available-for-Sale, Number of Securities | Security 25 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 $ (36,712) $ (9,011)
Available-for-Sale Within One Year, Estimated Fair Value $ 576,109 $ 723,500
Available-for-Sale Within One Year, Number of Securities | Security 125 139
Available-for-Sale More than One Year, Gross Unrealized Loss $ (17,786) $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value $ 211,006 $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security 45 15
Available-for-Sale, Gross Unrealized Loss $ (54,498) $ (11,099)
Available-for-Sale, Estimated Fair Value $ 787,115 $ 800,405
Available-for-Sale, Number of Securities | Security 170 154
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (8,799) $ (881)
Available-for-Sale Within One Year, Estimated Fair Value $ 70,102 $ 68,548
Available-for-Sale Within One Year, Number of Securities | Security 19 17
Available-for-Sale, Gross Unrealized Loss $ (8,799) $ (881)
Available-for-Sale, Estimated Fair Value $ 70,102 $ 68,548
Available-for-Sale, Number of Securities | Security 19 17