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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | $ 710,481,000 |  |  | $ 1,109,208,000 |  |
Financing receivable, allowance for credit loss | 9,873,000 | $ 10,439,000 | $ 9,864,000 | 9,600,000 | $ 12,056,000 | $ 12,915,000
Carrying Amount |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 710,481,000 |  |  | 1,109,208,000 |  |
Total impaired loans | 1,126,091,000 |  |  | 1,029,511,000 |  |
Equity Securities, FV-NI | 6,832,000 |  |  | 7,416,000 |  |
Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 710,481,000 |  |  | 1,109,208,000 |  |
Total impaired loans | 1,098,903,000 |  |  | 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 | 8,931,000 |  |  | 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 | 333,000 |  |  | 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 | 193,429,000 |  |  | 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 | 122,452,000 |  |  | 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 | 385,336,000 |  |  | 313,220,000 |  |
Corporate debt securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities |  |  |  | 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 | 710,481,000 |  |  | 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 | 1,098,903,000 |  |  | 1,015,052,000 |  |
Recurring | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 717,313,000 |  |  | 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 | 8,931,000 |  |  | 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 | 333,000 |  |  | 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 | 193,429,000 |  |  | 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 | 122,452,000 |  |  | 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 | 385,336,000 |  |  | 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 |  |  |  | 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 | 6,832,000 |  |  | 7,416,000 |  |
Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 6,832,000 |  |  | 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 |  |
Recurring | Level 1 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | 6,832,000 |  |  | 7,416,000 |  |
Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 710,481,000 |  |  | 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 | 8,931,000 |  |  | 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 | 333,000 |  |  | 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 | 193,429,000 |  |  | 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 | 122,452,000 |  |  | 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 | 385,336,000 |  |  | 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 |  |  |  | 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 |  |
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 | $ 0 |  |  | 292,000 |  |
Nonrecurring | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss |  |  |  | 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 |  |
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 |  |
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 |  |
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 |  |

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