Loans and Allowance for Loan Losses ("ALLL") - Category of Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		$ 4,677,646		$ 4,256,213
Less: allowance for credit losses	[1]	55,864	$ 55,817	58,375
Loans, net of the allowance for credit losses on loans		4,621,782		4,197,838
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		857,836		843,024
Less: allowance for credit losses		11,337	10,920	20,352
Commercial and Industrial lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		831,187		617,398
Less: allowance for credit losses		12,057	11,267	0
Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		178,855		278,579
Less: allowance for credit losses		4,828	6,428	9,229
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		1,400,338		1,278,479
Less: allowance for credit losses		16,455	17,042	19,119
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		674,041		574,852
Less: allowance for credit losses		4,587	3,918	3,749
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		393,867		360,046
Less: allowance for credit losses		3,237	3,134	5,598
Multifamily real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		275,795		240,230
Less: allowance for credit losses		2,673	2,427	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned fees		65,727		63,605
Less: allowance for credit losses		$ 690	$ 681	$ 328

[1] As of December 31, 2021, this line represents the allowance for loan and   lease losses. See further discussion in “Note 1: Nature of Operations and Summary of Significant Accounting Policies” in the Notes to Condensed Consolidated Financial Statements (unaudited).