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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities $ 668,300,000     $ 1,109,208,000    
Financing receivable, allowance for credit loss 10,366,000 $ 10,061,000 $ 9,873,000 9,600,000 $ 10,439,000 $ 12,915,000
Carrying Amount            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 668,300,000     1,109,208,000    
Total impaired loans 1,214,904,000     1,029,511,000    
Equity Securities, FV-NI 6,544,000     7,416,000    
Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 668,300,000     1,109,208,000    
Total impaired loans 1,181,932,000     1,015,052,000    
Loans, charge-offs 0 $ 0        
U.S. Treasury securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 8,548,000     9,925,000    
U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 333,000     379,000    
Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 182,598,000     526,467,000    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 115,340,000     214,439,000    
Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 361,481,000     313,220,000    
Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities       44,778,000    
Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Total impaired loans 0     0    
Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 668,300,000     1,109,208,000    
Total impaired loans 0     0    
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Total impaired loans 1,181,932,000     1,015,052,000    
Recurring | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 674,844,000     1,116,624,000    
Recurring | U.S. Treasury securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 8,548,000     9,925,000    
Recurring | U.S. Government agencies | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 333,000     379,000    
Recurring | Obligations of states and political subdivisions | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 182,598,000     526,467,000    
Recurring | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 115,340,000     214,439,000    
Recurring | Private label mortgage and asset backed securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 361,481,000     313,220,000    
Recurring | Corporate debt securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities       44,778,000    
Recurring | Other equity securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Securities, FV-NI 6,544,000     7,416,000    
Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 6,544,000     7,416,000    
Recurring | Level 1 | U.S. Treasury securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 1 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 1 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 1 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 1 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 1 | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities       0    
Recurring | Level 1 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Securities, FV-NI 6,544,000     7,416,000    
Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 668,300,000     1,109,208,000    
Recurring | Level 2 | U.S. Treasury securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 8,548,000     9,925,000    
Recurring | Level 2 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 333,000     379,000    
Recurring | Level 2 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 182,598,000     526,467,000    
Recurring | Level 2 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 115,340,000     214,439,000    
Recurring | Level 2 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 361,481,000     313,220,000    
Recurring | Level 2 | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities       44,778,000    
Recurring | Level 2 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Securities, FV-NI 0     0    
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 0     0    
Recurring | Level 3 | U.S. Treasury securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 3 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 3 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 3 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 3 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0     0    
Recurring | Level 3 | Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities       0    
Recurring | Level 3 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Securities, FV-NI 0     0    
Nonrecurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities fair value disclosure 0     0    
Nonrecurring | Carrying Amount | Impaired Financing Receivable [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total impaired loans $ 0     292,000    
Nonrecurring | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Financing receivable, allowance for credit loss       30,000    
Nonrecurring | Fair Value | Commercial real estate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total impaired loans       262    
Nonrecurring | Level 1 | Fair Value | Commercial real estate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total impaired loans       0    
Nonrecurring | Level 2 | Fair Value | Commercial real estate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total impaired loans       0    
Nonrecurring | Level 3 | Fair Value | Commercial real estate            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total impaired loans       $ 262