Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans	$ 71,515	$ 60,907
Nonperforming Financial Instruments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	5,279
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	21,871
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,754
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,597
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,029
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,936
Financing Receivable, Revolving	5,680
Financing Receivable, Revolving, Converted to Term Loan	17,369
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	878,780
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	873,069
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	710,133
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	462,165
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	346,689
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	372,114
Financing Receivable, Revolving	2,386,818
Non-accrual loans	25,446	19,545
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	11
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,059
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	394
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,941
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	935
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,719
Financing Receivable, Revolving	2,178
Financing Receivable, Revolving, Converted to Term Loan	14,209
Commercial and Industrial Total Energy Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	227,603
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	35,251
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	58,965
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	70,932
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,612
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10,951
Financing Receivable, Revolving	521,034
Non-accrual loans	10,293	11,500
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	5,268
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	56
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,321
Financing Receivable, Revolving	3,502
Financing Receivable, Revolving, Converted to Term Loan	146
Commercial Real Estate Buildings Land And Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	408,729
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,560,879
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,745,471
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,302,714
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	798,561
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,390,645
Financing Receivable, Revolving	243,671
Non-accrual loans	30,012	22,420
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	19,812
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,360
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,656
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,184
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	242,949
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	440,037
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	598,799
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	289,714
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	28,028
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,353
Financing Receivable, Revolving	171,536
Non-accrual loans	0	0
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	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	5,764	7,442
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	38
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,712
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	3,014
Consumer Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans	0	$ 0
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