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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | $ 479,622,000 |  | $ 463,905,000 |
Equity securities | 7,346,000 |  | 7,254,000 |
Available-for-sale debt securities | 479,622,000 |  | 463,905,000 |
Valuation allowance | 9,118,000 | $ 8,788,000 | 9,104,000 | $ 8,778,000
Carrying Amount |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 7,346,000 |  | 7,254,000 |
Available-for-sale debt securities | 479,622,000 |  | 463,905,000 |
Loans, net | 912,692,000 |  | 909,591,000 |
Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 7,346,000 |  | 7,254,000 |
Available-for-sale debt securities | 479,622,000 |  | 463,905,000 |
Loans, net | 902,412,000 |  | 899,214,000 |
Loans, charge-offs | 0 | $ 0 | 0 |
U.S. Government agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 18,929,000 |  | 21,321,000 |
Obligations of states and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 106,963,000 |  | 81,504,000 |
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 | 222,613,000 |  | 234,930,000 |
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 | 127,117,000 |  | 126,150,000 |
Corporate debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 4,000,000 |  |  |
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 | 479,622,000 |  | 463,905,000 |
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 | 902,412,000 |  | 899,214,000 |
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 486,968,000 |  | 471,159,000 |
Recurring | U.S. Government agencies | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 18,929,000 |  | 21,321,000 |
Recurring | Obligations of states and political subdivisions | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 106,963,000 |  | 81,504,000 |
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 | 222,613,000 |  | 234,930,000 |
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 | 127,117,000 |  | 126,150,000 |
Recurring | Corporate debt securities | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 4,000,000 |  |  |
Recurring | Other equity securities | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 7,346,000 |  | 7,254,000 |
Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 7,346,000 |  | 7,254,000 |
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 |  |  |
Recurring | Level 1 | Other equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 7,346,000 |  | 7,254,000 |
Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 479,622,000 |  | 463,905,000 |
Recurring | Level 2 | U.S. Government agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 18,929,000 |  | 21,321,000 |
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 106,963,000 |  | 81,504,000 |
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 | 222,613,000 |  | 234,930,000 |
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 | 127,117,000 |  | 126,150,000 |
Recurring | Level 2 | Corporate debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 4,000,000 |  |  |
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 |  |  |
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 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | 161,000 |
Nonrecurring | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value |  |  | 134,000 |
Valuation allowance |  |  | 27,000 |
Nonrecurring | Fair Value | Commercial real estate | Impaired Financing Receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | 134,000 |
Nonrecurring | Fair Value | Impaired Financing Receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | 134,000 |
Nonrecurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value |  |  | 0 |
Nonrecurring | Level 1 | Commercial real estate | Impaired Financing Receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | 0 |
Nonrecurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value |  |  | 0 |
Nonrecurring | Level 2 | Commercial real estate | Impaired Financing Receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | 0 |
Nonrecurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value |  |  | 134,000 |
Nonrecurring | Level 3 | Commercial real estate | Impaired Financing Receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans, net |  |  | $ 134,000 |

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