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Loans (Non-Accrual Loans, Segregated by Class of Loan and Year of Origination) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | $ 37,833 | $ 53,713
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,703,185 | 1,630,524
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 657,039 | 693,324
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 498,213 | 392,408
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 241,997 | 214,163
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 138,541 | 150,922
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 195,754 | 143,292
Financing Receivable, Revolving | 2,170,182 | 2,075,632
Non-accrual loans | 18,130 | 22,582
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 352,224 | 475,023
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 100,862 | 9,539
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 5,312 | 20,991
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 8,659 | 9,480
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 3,078 | 3,110
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,913 | 5,638
Financing Receivable, Revolving | 408,022 | 483,020
Non-accrual loans | 15,224 | 14,433
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,901,888 | 1,761,554
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,528,173 | 1,257,055
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,009,197 | 1,008,366
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 745,031 | 632,020
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 410,327 | 612,767
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 882,021 | 825,249
Financing Receivable, Revolving | 120,958 | 59,595
Non-accrual loans | 3,552 | 15,297
Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 666,024 | 693,192
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 491,563 | 268,080
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 130,888 | 178,226
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,236 | 2,339
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 486 | 484
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,726 | 1,930
Financing Receivable, Revolving | 181,180 | 160,020
Non-accrual loans | 0 | 948
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 927 | 440
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 0 | 13
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 6,301 | 6,687
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,510 | 5,111
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,161 | 13,851
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 4,845 | 3,959
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,473 | 2,795
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,700 | 3,423
Financing Receivable, Revolving | 10,604 | 11,566
Financing Receivable, Revolving, Converted to Term Loan | 10,239 | 6,321
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 636
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,252 | 3,856
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,089 | 5,047
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,242 | 1,820
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,197 | 765
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 191 | 353
Financing Receivable, Revolving | 2,973 | 4,635
Financing Receivable, Revolving, Converted to Term Loan | 8,186 | 5,470
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 | 4,657 | 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 | 72 | 5,358
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,386 | 1,325
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 10 | 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Revolving | 7,631 | 6,931
Financing Receivable, Revolving, Converted to Term Loan | 1,468 | 819
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 | 1,644 | 6,038
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 307
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 3,446
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 217 | 814
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 266 | 2,030
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,425 | 2,662
Financing Receivable, Revolving | 0 | 0
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 | 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 948
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 | 258 | 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 | 84 | 408
Financing Receivable, Revolving | 0 | 0
Financing Receivable, Revolving, Converted to Term Loan | 585 | 32
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 13
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

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