Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Non-accrual loans	$ 35,125	$ 53,713
Nonperforming Financial Instruments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	6,895
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,654
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,520
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,736
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,825
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,625
Financing Receivable, Revolving	5,235
Financing Receivable, Revolving, Converted to Term Loan	2,635
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,027,153
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	852,191
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	582,273
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	289,898
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	167,930
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	232,809
Financing Receivable, Revolving	2,318,394
Non-accrual loans	11,170	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	98
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,520
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,507
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,491
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	653
Financing Receivable, Revolving	108
Financing Receivable, Revolving, Converted to Term Loan	1,793
Commercial and Industrial Total Energy Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	328,807
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	111,479
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,821
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,669
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,735
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	5,403
Financing Receivable, Revolving	467,542
Non-accrual loans	11,114	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	5,779
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	21
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	5,127
Financing Receivable, Revolving, Converted to Term Loan	187
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	1,173,006
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,548,499
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,118,143
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	895,947
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	478,947
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,100,358
Financing Receivable, Revolving	96,082
Non-accrual loans	11,806	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	1,116
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,556
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	229
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	313
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,592
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	315,359
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	663,001
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	182,566
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	114,018
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	631
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,205
Financing Receivable, Revolving	253,781
Non-accrual loans	0	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	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	1,035	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	380
Financing Receivable, Revolving	0
Financing Receivable, Revolving, Converted to Term Loan	655
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