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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | $ 631,854,000 |  |  | $ 470,746,000 |  |
Equity securities | 7,655,000 |  |  | 7,472,000 |  |
Available-for-sale debt securities | 631,854,000 |  |  | 470,746,000 |  |
Financing receivable, allowance for credit loss | 14,657,000 | $ 9,495,000 | $ 13,937,000 | 9,130,000 | $ 9,405,000 | $ 9,104,000
Carrying Amount |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,655,000 |  |  | 7,472,000 |  |
Available-for-sale debt securities | 631,854,000 |  |  | 470,746,000 |  |
Loans, net | 1,095,232,000 |  |  | 934,250,000 |  |
Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,655,000 |  |  | 7,472,000 |  |
Available-for-sale debt securities | 631,854,000 |  |  | 470,746,000 |  |
Loans, net | 1,086,793,000 |  |  | 928,807,000 |  |
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 | 40,628,000 |  |  | 14,494,000 |  |
Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 294,873,000 |  |  | 91,111,000 |  |
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 | 217,282,000 |  |  | 196,719,000 |  |
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 | 55,222,000 |  |  | 159,378,000 |  |
Corporate debt securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 23,849,000 |  |  | 9,044,000 |  |
Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  |  | 0 |  |
Loans, net | 0 |  |  | 0 |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 631,854,000 |  |  | 470,746,000 |  |
Loans, net | 0 |  |  | 0 |  |
Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  |  | 0 |  |
Loans, net | 1,086,793,000 |  |  | 928,807,000 |  |
Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 639,509,000 |  |  | 478,218,000 |  |
Recurring | U.S. Government agencies | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 40,628,000 |  |  | 14,494,000 |  |
Recurring | Obligations of states and political subdivisions | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 294,873,000 |  |  | 91,111,000 |  |
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 | 217,282,000 |  |  | 196,719,000 |  |
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 | 55,222,000 |  |  | 159,378,000 |  |
Recurring | Corporate debt securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities |  |  |  | 9,044,000 |  |
Recurring | Corporate debt securities | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 23,849,000 |  |  |  |  |
Recurring | Other equity securities | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,655,000 |  |  | 7,472,000 |  |
Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 7,655,000 |  |  | 7,472,000 |  |
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 | 7,655,000 |  |  | 7,472,000 |  |
Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 631,854,000 |  |  | 470,746,000 |  |
Recurring | Level 2 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 40,628,000 |  |  | 14,494,000 |  |
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 294,873,000 |  |  | 91,111,000 |  |
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 | 217,282,000 |  |  | 196,719,000 |  |
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 | 55,222,000 |  |  | 159,378,000 |  |
Recurring | Level 2 | Corporate debt securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 23,849,000 |  |  | 9,044,000 |  |
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] |  |  |  |  |  |
Loans, net | 1,735,000 |  |  |  |  |
Nonrecurring | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 1,248 |  |  |  |  |
Financing receivable, allowance for credit loss | 487,000 |  |  |  |  |
Nonrecurring | Fair Value | Commercial real estate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | 1,248 |  |  |  |  |
Nonrecurring | Fair Value | Impaired Financing Receivable [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | 1,248,000 |  |  |  |  |
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] |  |  |  |  |  |
Loans, net | 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] |  |  |  |  |  |
Loans, net | 0 |  |  |  |  |
Nonrecurring | Level 3 | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 1,248 |  |  |  |  |
Nonrecurring | Level 3 | Fair Value | Commercial real estate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | $ 1,248 |  |  |  |  |

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