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Loans (Non-Accrual Loans, Segregated by Class of Loan and Year of Origination) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | $ 53,713 | $ 61,449
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,630,524 | 1,397,141
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 693,324 | 608,464
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 392,408 | 343,825
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 214,163 | 258,737
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 150,922 | 121,652
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 143,292 | 119,250
Financing Receivable, Revolving | 2,075,632 | 2,019,121
Non-accrual loans | 22,582 | 19,849
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 475,023 | 524,270
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 9,539 | 48,853
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 20,991 | 16,310
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 9,480 | 8,083
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 3,110 | 2,174
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 5,638 | 5,346
Financing Receivable, Revolving | 483,020 | 592,094
Non-accrual loans | 14,433 | 23,168
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 | 1,761,554 | 1,629,815
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,257,055 | 1,086,073
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,008,366 | 883,701
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 632,020 | 764,197
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 612,767 | 495,617
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 825,249 | 804,894
Financing Receivable, Revolving | 59,595 | 74,403
Non-accrual loans | 15,297 | 15,737
Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 693,192 | 420,477
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 268,080 | 452,644
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 178,226 | 196,170
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,339 | 2,915
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 484 | 1,144
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,930 | 1,758
Financing Receivable, Revolving | 160,020 | 147,575
Non-accrual loans | 948 | 1,684
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 440 | 993
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 13 | 18
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 6,687 | 16,498
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,111 | 15,154
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 13,851 | 4,989
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,959 | 3,719
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,795 | 2,038
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,423 | 3,532
Financing Receivable, Revolving | 11,566 | 12,414
Financing Receivable, Revolving, Converted to Term Loan | 6,321 | 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 | 636 | 9,479
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,856 | 3,351
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 5,047 | 1,846
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,820 | 1,489
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 765 | 105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 353 | 29
Financing Receivable, Revolving | 4,635 | 839
Financing Receivable, Revolving, Converted to Term Loan | 5,470 | 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 | 0 | 2,421
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 6,772
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 5,358 | 2,144
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,325 | 0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 359
Financing Receivable, Revolving | 6,931 | 11,193
Financing Receivable, Revolving, Converted to Term Loan | 819 | 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 | 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Revolving | 0 | 0
Financing Receivable, Revolving, Converted to Term Loan | 0 | 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 | 6,038 | 2,914
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 307 | 5,031
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 3,446 | 999
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 814 | 2,019
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,030 | 1,933
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,662 | 2,736
Financing Receivable, Revolving | 0 | 105
Financing Receivable, Revolving, Converted to Term Loan | 0 | 0
Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 1,684
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 948 | 0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Revolving | 0 | 0
Financing Receivable, Revolving, Converted to Term Loan | 0 | 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 | 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 211
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 408 | 408
Financing Receivable, Revolving | 0 | 259
Financing Receivable, Revolving, Converted to Term Loan | 32 | 115
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 13 | 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Revolving | 0 | 18
Financing Receivable, Revolving, Converted to Term Loan | $ 0 | $ 0

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