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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     $ 1,060,362,000   $ 710,092,000    
Equity securities     7,486,000   7,634,000    
Available-for-sale debt securities     1,060,362,000   710,092,000    
Financing receivable, allowance for credit loss $ 14,657,000   10,061,000 $ 10,439,000 12,915,000 $ 13,937,000 $ 9,130,000
Carrying Amount              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     7,486,000   7,634,000    
Available-for-sale debt securities     1,060,362,000   710,092,000    
Total impaired loans     1,073,436,000   1,089,432,000    
Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     7,486,000   7,634,000    
Available-for-sale debt securities     1,060,362,000   710,092,000    
Total impaired loans     1,065,575,000   1,087,124,000    
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     10,010,000        
U.S. Government agencies              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale debt securities     505,000   680,000    
Obligations of states and political subdivisions              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale debt securities     507,920,000   379,565,000    
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     228,045,000   216,298,000    
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     253,756,000   83,508,000    
Corporate debt securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Available-for-sale debt securities     60,126,000   30,041,000    
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     1,060,362,000   710,092,000    
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     1,065,575,000   1,087,124,000    
Recurring              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets, fair value     1,067,848,000   717,726,000    
Recurring | U.S. Treasury securities | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     10,010,000        
Recurring | U.S. Government agencies | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     505,000   680,000    
Recurring | Obligations of states and political subdivisions | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     507,920,000   379,565,000    
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]              
Equity securities     228,045,000   216,298,000    
Recurring | Private label mortgage and asset backed securities | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     253,756,000   83,508,000    
Recurring | Corporate debt securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities         30,041,000    
Recurring | Corporate debt securities | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     60,126,000        
Recurring | Other equity securities | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     7,486,000   7,634,000    
Recurring | Level 1              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets, fair value     7,486,000   7,634,000    
Recurring | Level 1 | U.S. Treasury securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     0        
Recurring | Level 1 | U.S. Government agencies              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity 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]              
Equity 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]              
Equity 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]              
Equity securities     0   0    
Recurring | Level 1 | Corporate debt securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     0   0    
Recurring | Level 1 | Other equity securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     7,486,000   7,634,000    
Recurring | Level 2              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Assets, fair value     1,060,362,000   710,092,000    
Recurring | Level 2 | U.S. Treasury securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     10,010,000        
Recurring | Level 2 | U.S. Government agencies              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     505,000   680,000    
Recurring | Level 2 | Obligations of states and political subdivisions              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     507,920,000   379,565,000    
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]              
Equity securities     228,045,000   216,298,000    
Recurring | Level 2 | Private label mortgage and asset backed securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     253,756,000   83,508,000    
Recurring | Level 2 | Corporate debt securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     60,126,000   30,041,000    
Recurring | Level 2 | Other equity securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     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]              
Equity securities     0        
Recurring | Level 3 | U.S. Government agencies              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity 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]              
Equity 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]              
Equity 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]              
Equity securities     0   0    
Recurring | Level 3 | Corporate debt securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     0   0    
Recurring | Level 3 | Other equity securities              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Equity securities     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   304,000          
Nonrecurring | Fair Value              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Financing receivable, allowance for credit loss   42,000          
Nonrecurring | Fair Value | Commercial real estate              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Total impaired loans     262   1,260    
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 | 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 | 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 | Commercial real estate              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Total impaired loans     $ 262   $ 1,260