Loans - Financing Receivable, Gross Charge-Offs By Year of Origination (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,145,305		$ 1,145,305
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	941,744		941,744
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	561,695		561,695
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	420,405		420,405
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	211,653		211,653
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	258,011		258,011
Financing Receivable, Revolving	2,122,788		2,122,788
Financing Receivable, Allowance for Credit Loss, Writeoff	7,136	$ 1,891	13,316	$ 5,346
Commercial and Industrial Total Energy Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	311,743		311,743
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	70,287		70,287
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	83,419		83,419
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,469		4,469
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,643		7,643
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,089		6,089
Financing Receivable, Revolving	466,945		466,945
Financing Receivable, Allowance for Credit Loss, Writeoff	518	0	518	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	718,176		718,176
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,786,515		1,786,515
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,488,642		1,488,642
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	923,237		923,237
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	644,069		644,069
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,101,800		1,101,800
Financing Receivable, Revolving	155,033		155,033
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	299,297		299,297
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	570,101		570,101
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	352,871		352,871
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	51,647		51,647
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	945		945
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,666		1,666
Financing Receivable, Revolving	191,544		191,544
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	1,080	131	1,330	362
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	7,016	5,322	13,958	11,093
Loans Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	15,750	$ 7,344	29,122	$ 17,874
Nonperforming Financial Instruments [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	12,248		12,248
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8		8
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	517		517
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	19,180		19,180
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,259		8,259
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,912		4,912
Financing Receivable, Revolving	21,578		21,578
Financing Receivable, Revolving, Converted to Term Loan	1,079		1,079
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		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	221		221
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	754		754
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,957		2,957
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,172		1,172
Financing Receivable, Revolving	16,746		16,746
Financing Receivable, Revolving, Converted to Term Loan	367		367
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	10,324		10,324
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	59		59
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,349		1,349
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2		2
Financing Receivable, Revolving	4,832		4,832
Financing Receivable, Revolving, Converted to Term Loan	146		146
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	1,924		1,924
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8		8
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	296		296
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	18,328		18,328
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,483		1,483
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,643		3,643
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	0		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		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	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]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		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	0		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	39		39
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,470		2,470
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	95		95
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving, Converted to Term Loan	566		566
Nonperforming Financial Instruments [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		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	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
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	8,267		8,267
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,562		4,562
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	515		515
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	67		67
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25		25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	141		141
Financing Receivable, Revolving	9,439		9,439
Financing Receivable, Revolving, Converted to Term Loan	6,106		6,106
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	124		124
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	208		208
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	178		178
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	55		55
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25		25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	29		29
Financing Receivable, Revolving	7,427		7,427
Financing Receivable, Revolving, Converted to Term Loan	5,270		5,270
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		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	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	518		518
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		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	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
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		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	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
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		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	280		280
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	89		89
Financing Receivable, Revolving	961		961
Financing Receivable, Revolving, Converted to Term Loan	0		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	8,143		8,143
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,354		4,354
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	57		57
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12		12
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	23		23
Financing Receivable, Revolving	1,051		1,051
Financing Receivable, Revolving, Converted to Term Loan	$ 318		$ 318