Annual report pursuant to Section 13 and 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)

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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
Dec. 31, 2021
USD ($)
Security
Dec. 31, 2020
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (9,953) $ (406)
Available-for-Sale Within One Year, Estimated Fair Value $ 800,439 $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security 158 32
Available-for-Sale More than One Year, Gross Unrealized Loss $ (2,088)  
Available-for-Sale More than One Year, Estimated Fair Value $ 76,905  
Available-for-Sale More than One Year, Number of Securities | Security 15  
Available-for-Sale, Gross Unrealized Loss $ (12,041) $ (406)
Available-for-Sale, Estimated Fair Value $ 877,344 $ 178,681
Available-for-Sale, Number of Securities | Security 173 32
Municipal bonds-tax exempt    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (881)  
Available-for-Sale Within One Year, Estimated Fair Value $ 68,548  
Available-for-Sale Within One Year, Number of Securities | Security 17  
Available-for-Sale, Gross Unrealized Loss $ (881)  
Available-for-Sale, Estimated Fair Value $ 68,548  
Available-for-Sale, Number of Securities | Security 17  
U.S. Treasury securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (61)  
Available-for-Sale Within One Year, Estimated Fair Value $ 8,391  
Available-for-Sale Within One Year, Number of Securities | Security 2  
Available-for-Sale, Gross Unrealized Loss $ (61)  
Available-for-Sale, Estimated Fair Value $ 8,391  
Available-for-Sale, Number of Securities | Security 2  
Mortgage-backed securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (6,252) $ (188)
Available-for-Sale Within One Year, Estimated Fair Value $ 535,610 $ 76,023
Available-for-Sale Within One Year, Number of Securities | Security 102 10
Available-for-Sale More than One Year, Gross Unrealized Loss $ (1,654)  
Available-for-Sale More than One Year, Estimated Fair Value $ 59,457  
Available-for-Sale More than One Year, Number of Securities | Security 11  
Available-for-Sale, Gross Unrealized Loss $ (7,906) $ (188)
Available-for-Sale, Estimated Fair Value $ 595,067 $ 76,023
Available-for-Sale, Number of Securities | Security 113 10
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1,256) $ (217)
Available-for-Sale Within One Year, Estimated Fair Value $ 76,894 $ 97,659
Available-for-Sale Within One Year, Number of Securities | Security 16 21
Available-for-Sale More than One Year, Gross Unrealized Loss $ (334)  
Available-for-Sale More than One Year, Estimated Fair Value $ 12,548  
Available-for-Sale More than One Year, Number of Securities | Security 3  
Available-for-Sale, Gross Unrealized Loss $ (1,590) $ (217)
Available-for-Sale, Estimated Fair Value $ 89,442 $ 97,659
Available-for-Sale, Number of Securities | Security 19 21
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1,503) $ (1)
Available-for-Sale Within One Year, Estimated Fair Value $ 110,996 $ 4,999
Available-for-Sale Within One Year, Number of Securities | Security 21 1
Available-for-Sale More than One Year, Gross Unrealized Loss $ (100)  
Available-for-Sale More than One Year, Estimated Fair Value $ 4,900  
Available-for-Sale More than One Year, Number of Securities | Security 1  
Available-for-Sale, Gross Unrealized Loss $ (1,603) $ (1)
Available-for-Sale, Estimated Fair Value $ 115,896 $ 4,999
Available-for-Sale, Number of Securities | Security 22 1
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (9,011) $ (406)
Available-for-Sale Within One Year, Estimated Fair Value $ 723,500 $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security 139 32
Available-for-Sale More than One Year, Gross Unrealized Loss $ (2,088)  
Available-for-Sale More than One Year, Estimated Fair Value $ 76,905  
Available-for-Sale More than One Year, Number of Securities | Security 15  
Available-for-Sale, Gross Unrealized Loss $ (11,099) $ (406)
Available-for-Sale, Estimated Fair Value $ 800,405 $ 178,681
Available-for-Sale, Number of Securities | Security 154 32