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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 |  |  |

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