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Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans	$ 48,966	$ 53,713
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	8,885
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,980
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,148
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,083
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,355
Financing Receivable, Revolving	8,035
Financing Receivable, Revolving, Converted to Term Loan	9,480
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	844,354
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	953,664
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	616,642
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	331,729
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	189,719
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	255,999
Financing Receivable, Revolving	2,331,781
Non-accrual loans	16,693	22,582
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	478
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,101
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,910
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,552
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,033
Financing Receivable, Revolving	2,038
Financing Receivable, Revolving, Converted to Term Loan	3,581
Commercial and Industrial Total Energy Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	289,573
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	125,803
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,629
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	18,726
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,603
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	5,843
Financing Receivable, Revolving	521,322
Non-accrual loans	12,271	14,433
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	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,039
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,137
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	5,997
Financing Receivable, Revolving, Converted to Term Loan	98
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	660,171
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,606,760
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,231,072
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	938,002
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	553,657
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,200,107
Financing Receivable, Revolving	81,435
Non-accrual loans	19,003	15,297
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	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,407
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	296
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,199
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	394
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,932
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	5,775
Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	202,584
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	662,966
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	201,069
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	141,510
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	636
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,265
Financing Receivable, Revolving	207,182
Non-accrual loans	583	948
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	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	583
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	416	440
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	390
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	26
Consumer Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans	0	$ 13
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

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