Loans and Allowance for Credit Losses - Category of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 5,796,599		$ 5,372,729
Less: allowance for credit losses	67,567	$ 65,130	61,775
Loans, net of the allowance for credit losses on loans	$ 5,729,032		$ 5,310,954
Percentage Of Loans	100.00%		100.00%
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 2,057,912		$ 1,974,932
Less: allowance for credit losses	$ 28,929	27,660	$ 26,803
Percentage Of Loans	36.00%		37.00%
Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 232,863		$ 173,218
Less: allowance for credit losses	$ 4,914	4,679	$ 4,396
Percentage Of Loans	4.00%		3.00%
Commercial Real Estate - Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 542,827		$ 437,119
Less: allowance for credit losses	$ 6,361	5,610	$ 5,214
Percentage Of Loans	9.00%		8.00%
Commercial real estate - non-owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 2,480,282		$ 2,314,600
Less: allowance for credit losses	$ 23,981	23,807	$ 21,880
Percentage Of Loans	42.00%		43.00%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 439,434		$ 439,367
Less: allowance for credit losses	$ 3,268	3,265	$ 3,333
Percentage Of Loans	8.00%		8.00%
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees	$ 43,281		$ 33,493
Less: allowance for credit losses	$ 114	$ 109	$ 149
Percentage Of Loans	1.00%		1.00%