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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities $ 1,161,756,000   $ 1,109,208,000  
Financing receivable, allowance for credit loss 9,864,000 $ 12,056,000 9,600,000 $ 12,915,000
Carrying Amount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities 1,161,756,000   1,109,208,000  
Total impaired loans 1,002,178,000   1,029,511,000  
Equity Securities, FV-NI 7,071,000   7,416,000  
Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities 1,161,756,000   1,109,208,000  
Total impaired loans 965,154,000   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 9,258,000   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 344,000   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 409,129,000   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 221,304,000   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 475,813,000   313,220,000  
Corporate debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities 45,908,000   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 1,161,756,000   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 965,154,000   1,015,052,000  
Recurring | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 1,168,827,000   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 9,258,000   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 344,000   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 409,129,000   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 221,304,000   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 475,813,000   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 45,908,000   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 7,071,000   7,416,000  
Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 7,071,000   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   0  
Recurring | Level 1 | Other equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI 7,071,000   7,416,000  
Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 1,161,756,000   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 9,258,000   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 344,000   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 409,129,000   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 221,304,000   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 475,813,000   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 45,908,000   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   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 280,000   292,000  
Nonrecurring | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 262      
Financing receivable, allowance for credit loss 18,000   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   262  
Nonrecurring | Fair Value | Impaired Financing Receivable [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 262,000      
Nonrecurring | Level 1 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 0      
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   0  
Nonrecurring | Level 2 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 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   0  
Nonrecurring | Level 3 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 262      
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   $ 262