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Loans (Non-Accrual Loans, Segregated by Class of Loan and Year of Origination) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | $ 61,449 | $ 102,303
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,397,141 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 608,464 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 343,825 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 258,737 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 121,652 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 119,250 |
Financing Receivable, Revolving | 2,019,121 |
Non-accrual loans | 19,849 | 26,038
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 524,270 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 48,853 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 16,310 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 8,083 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,174 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 5,346 |
Financing Receivable, Revolving | 592,094 |
Non-accrual loans | 23,168 | 65,761
Paycheck Protection Program [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 0 | 0
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,629,815 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,086,073 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 883,701 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 764,197 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 495,617 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 804,894 |
Financing Receivable, Revolving | 74,403 |
Non-accrual loans | 15,737 | 8,912
Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 420,477 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 452,644 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 196,170 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,915 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,144 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,758 |
Financing Receivable, Revolving | 147,575 |
Non-accrual loans | 1,684 | 665
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 993 | 922
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 18 | $ 5
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 16,498 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 15,154 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 4,989 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,719 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,038 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,532 |
Financing Receivable, Revolving | 12,414 |
Financing Receivable, Revolving, Converted to Term Loan | 3,105 |
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 9,479 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,351 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,846 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,489 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 105 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 29 |
Financing Receivable, Revolving | 839 |
Financing Receivable, Revolving, Converted to Term Loan | 2,711 |
Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 2,421 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 6,772 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 2,144 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 359 |
Financing Receivable, Revolving | 11,193 |
Financing Receivable, Revolving, Converted to Term Loan | 279 |
Nonperforming Financial Instruments [Member] | Paycheck Protection Program [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |
Financing Receivable, Revolving | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |
Nonperforming Financial Instruments [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 2,914 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,031 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 999 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,019 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,933 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,736 |
Financing Receivable, Revolving | 105 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |
Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,684 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |
Financing Receivable, Revolving | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |
Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 211 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 408 |
Financing Receivable, Revolving | 259 |
Financing Receivable, Revolving, Converted to Term Loan | 115 |
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |
Financing Receivable, Revolving | 18 |
Financing Receivable, Revolving, Converted to Term Loan | $ 0 |

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