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Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | $ 91,578 | $ 102,303
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 35,572 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 16,778 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 4,680 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,846 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,300 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 4,023 |
Financing Receivable, Revolving | 17,326 |
Financing Receivable, Revolving, Converted to Term Loan | 9,053 |
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,189,149 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 669,507 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 399,543 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 285,092 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 133,505 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 131,886 |
Financing Receivable, Revolving | 1,946,379 |
Non-accrual loans | 21,566 | 26,038
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 9,317 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,743 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,886 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,263 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 110 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 51 |
Financing Receivable, Revolving | 1,879 |
Financing Receivable, Revolving, Converted to Term Loan | 3,317 |
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 667,227 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 57,989 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 21,091 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 7,942 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,388 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 5,775 |
Financing Receivable, Revolving | 553,059 |
Non-accrual loans | 54,041 | 65,761
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 | 24,149 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 7,021 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 2,204 |
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 | 15,054 |
Financing Receivable, Revolving, Converted to Term Loan | 5,613 |
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 | 1,204,132 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,142,733 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 940,137 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 810,297 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 553,477 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 950,369 |
Financing Receivable, Revolving | 74,384 |
Non-accrual loans | 13,525 | 8,912
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 | 1,426 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 6,014 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 169 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,372 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 840 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,590 |
Financing Receivable, Revolving | 114 |
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 | 310,240 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 488,536 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 251,868 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 40,441 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,164 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,731 |
Financing Receivable, Revolving | 179,100 |
Non-accrual loans | 680 | 665
Construction Loans [Member] | Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 680 |
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 |
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 1,748 | 922
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 | 421 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 211 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 350 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 382 |
Financing Receivable, Revolving | 261 |
Financing Receivable, Revolving, Converted to Term Loan | 123 |
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Non-accrual loans | 18 | $ 5
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 | 18 |
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 | 64,957 |
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 | 47,897 |
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 | 57,609 |
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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