Loans - Financing Receivable, Gross Charge-Offs By Year of Origination (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 4,200
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	828,110
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,039,545
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	624,808
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	448,505
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	220,055
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	300,049
Financing Receivable, Revolving	2,133,845
Financing Receivable, Allowance for Credit Loss, Writeoff	6,180	$ 3,455
Commercial and Industrial Total Energy Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	325,616
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,754
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	94,011
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,887
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,100
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,311
Financing Receivable, Revolving	491,780
Financing Receivable, Allowance for Credit Loss, Writeoff	0	371
Commercial Real Estate Buildings Land And Other Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	447,974
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,766,241
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,482,017
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	968,630
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	676,887
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,186,720
Financing Receivable, Revolving	154,539
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	214,583
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	553,934
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	427,754
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	101,526
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	961
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,970
Financing Receivable, Revolving	180,876
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Total consumer real estate loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	250	231
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	6,942	5,771
Loans Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	13,372	$ 10,530
Nonperforming Financial Instruments [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,812
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,843
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,587
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	919
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,703
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,903
Financing Receivable, Revolving	7,909
Financing Receivable, Revolving, Converted to Term Loan	5,734
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	139
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,026
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	815
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,121
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,247
Financing Receivable, Revolving	690
Financing Receivable, Revolving, Converted to Term Loan	3,456
Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,812
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,161
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	72
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,371
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8
Financing Receivable, Revolving	7,219
Financing Receivable, Revolving, Converted to Term Loan	1,706
Nonperforming Financial Instruments [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,543
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	303
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	211
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,547
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	0
Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [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
Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member]
Financing Receivable, Allowance for Credit Loss [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	258
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	32
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	101
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	572
Nonperforming Financial Instruments [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [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
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,974
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,369
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	202
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	66
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12
Financing Receivable, Revolving	3,782
Financing Receivable, Revolving, Converted to Term Loan	2,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	69
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	167
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	54
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	3,134
Financing Receivable, Revolving, Converted to Term Loan	2,731
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member]
Financing Receivable, Allowance for Credit Loss [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
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]
Financing Receivable, Allowance for Credit Loss [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
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [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
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member]
Financing Receivable, Allowance for Credit Loss [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	250
Financing Receivable, Revolving, Converted to Term Loan	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,974
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,300
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	35
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12
Financing Receivable, Revolving	398
Financing Receivable, Revolving, Converted to Term Loan	$ 211