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Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | $ 57,250 | $ 61,449
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,546 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 12,990 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 12,080 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,441 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 3,128 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 4,706 |
Financing Receivable, Revolving | 14,273 |
Financing Receivable, Revolving, Converted to Term Loan | 5,086 |
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 742,844 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 834,516 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 511,102 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 276,574 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 200,227 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 190,390 |
Financing Receivable, Revolving | 1,907,724 |
Non-accrual loans | 16,169 | 19,849
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [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 | 8,905 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 2,303 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 941 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,035 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 79 |
Financing Receivable, Revolving | 328 |
Financing Receivable, Revolving, Converted to Term Loan | 2,578 |
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 415,757 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 14,088 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 41,212 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 12,931 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 6,623 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 6,412 |
Financing Receivable, Revolving | 495,458 |
Non-accrual loans | 25,783 | 23,168
Commercial and Industrial Total Energy Loans [Member] | Nonperforming Financial Instruments [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 | 523 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 6,855 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,658 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 335 |
Financing Receivable, Revolving | 13,945 |
Financing Receivable, Revolving, Converted to Term Loan | 2,467 |
Paycheck Protection Program [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 0 | 0
Paycheck Protection Program [Member] | Nonperforming Financial Instruments [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 |
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 738,386 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,455,839 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,031,482 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 747,435 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 687,351 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,086,426 |
Financing Receivable, Revolving | 58,703 |
Non-accrual loans | 13,180 | 15,737
Commercial Real Estate Buildings Land And Other Loans [Member] | Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,546 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,895 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 2,922 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 842 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,093 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,882 |
Financing Receivable, Revolving | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |
Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 298,862 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 294,840 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 367,127 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 48,269 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 542 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,646 |
Financing Receivable, Revolving | 154,023 |
Non-accrual loans | 1,667 | 1,684
Construction Loans [Member] | Nonperforming Financial Instruments [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 | 1,667 |
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 |
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 451 | 993
Total consumer real estate loans [Member] | Nonperforming Financial Instruments [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 | 410 |
Financing Receivable, Revolving | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 41 |
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 0 | $ 18
Consumer Loan [Member] | Nonperforming Financial Instruments [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 |
Revolving Loans Converted to Term [Member] | Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Revolving, Converted to Term Loan | 91,968 |
Revolving Loans Converted to Term [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Revolving, Converted to Term Loan | 30,721 |
Revolving Loans Converted to Term [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Revolving, Converted to Term Loan | 84,115 |
Revolving Loans Converted to Term [Member] | Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Revolving, Converted to Term Loan | $ 0 |

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