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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities $ 768,719,000   $ 710,092,000  
Equity securities 7,500,000   7,634,000  
Available-for-sale debt securities 768,719,000   710,092,000  
Financing receivable, allowance for credit loss 12,056,000 $ 10,546,000 12,915,000 $ 9,130,000
Carrying Amount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 7,500,000   7,634,000  
Available-for-sale debt securities 768,719,000   710,092,000  
Total impaired loans 1,078,284,000   1,089,432,000  
Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 7,500,000   7,634,000  
Available-for-sale debt securities 768,719,000   710,092,000  
Total impaired loans 1,094,929,000   1,087,124,000  
Loans, charge-offs 0 $ 0    
U.S. Government agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities 655,000   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 413,483,000   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 214,386,000   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 107,920,000   83,508,000  
Corporate debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale debt securities 32,275,000   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 768,719,000   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 1,094,929,000   1,087,124,000  
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 776,219,000   717,726,000  
Recurring | U.S. Government agencies | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 655,000   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 413,483,000   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 214,386,000   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 107,920,000   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 32,275,000      
Recurring | Other equity securities | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 7,500,000   7,634,000  
Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 7,500,000   7,634,000  
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 7,500,000   7,634,000  
Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 768,719,000   710,092,000  
Recurring | Level 2 | U.S. Government agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 655,000   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 413,483,000   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 214,386,000   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 107,920,000   83,508,000  
Recurring | Level 2 | Corporate debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 32,275,000   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. 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 2,791,000      
Nonrecurring | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 2,379      
Other repossessed assets 0      
Assets, fair value 2,379      
Financing receivable, allowance for credit loss 412,000      
Nonrecurring | Fair Value | Commercial real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 1,262   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 2,379,000      
Nonrecurring | Fair Value | Commercial and industrial        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 194      
Nonrecurring | Fair Value | Equity loans and lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 923      
Nonrecurring | Level 1 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Other repossessed assets 0      
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 1 | Fair Value | Commercial and industrial        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Nonrecurring | Level 1 | Fair Value | Equity loans and lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Nonrecurring | Level 2 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Other repossessed assets 0      
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 2 | Fair Value | Commercial and industrial        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Nonrecurring | Level 2 | Fair Value | Equity loans and lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0      
Nonrecurring | Level 3 | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 2,379      
Other repossessed assets 0      
Assets, fair value 2,379      
Nonrecurring | Level 3 | Fair Value | Commercial real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 1,262   $ 1,260  
Nonrecurring | Level 3 | Fair Value | Commercial and industrial        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 194      
Nonrecurring | Level 3 | Fair Value | Equity loans and lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans $ 923