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Loans (Revolving Loans Converted to Term) (Details) - Revolving Loans Converted to Term - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | $ 172,955 | $ 111,007
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | 40,099 | 47,562
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | 54,996 | 33,150
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | 68,337 | 10,505
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | 0 | 1,131
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | 1,156 | 2,264
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Remaining Revolving Loans Converted to Term During Period | $ 8,367 | $ 16,395

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