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Loans Loans - Non-Accrual Loans, Segregated by Class of Loans and Year of Origination (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]    
Non-accrual loans $ 50,976 $ 61,449
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 14,597  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 11,772  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,811  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 3,318  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,186  
Financing Receivable, Revolving 10,498  
Financing Receivable, Revolving, Converted to Term Loan 2,794  
Commercial Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year 523,775  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 941,431  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 562,889  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 304,835  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 217,911  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 214,083  
Financing Receivable, Revolving 1,919,495  
Non-accrual loans 18,509 19,849
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 10,344  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,463  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 921  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,204  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 114  
Financing Receivable, Revolving 827  
Financing Receivable, Revolving, Converted to Term Loan 2,636  
Commercial and Industrial Total Energy Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year 418,824  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 56,876  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 45,652  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 14,746  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 7,330  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 7,194  
Financing Receivable, Revolving 519,079  
Non-accrual loans 16,042 23,168
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 900  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,314  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,901  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 347  
Financing Receivable, Revolving 6,466  
Financing Receivable, Revolving, Converted to Term Loan 114  
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 384,018  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,604,500  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,041,700  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 796,983  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 725,449  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,166,794  
Financing Receivable, Revolving 67,785  
Non-accrual loans 14,246 15,737
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 1,700  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,995  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 989  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,114  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 3,261  
Financing Receivable, Revolving 3,187  
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 183,599  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 312,982  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 439,531  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 152,541  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,873  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,848  
Financing Receivable, Revolving 142,620  
Non-accrual loans 1,653 1,684
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 1,653  
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 508 993
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 464  
Financing Receivable, Revolving 0  
Financing Receivable, Revolving, Converted to Term Loan 44  
Consumer Loan [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Non-accrual loans 18 $ 18
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 18  
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Commercial Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 85,809  
Revolving Loans Converted to Term [Member] | Commercial and Industrial Total Energy Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 32,508  
Revolving Loans Converted to Term [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 79,807  
Revolving Loans Converted to Term [Member] | Construction Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 0