Loans and Leases Held for Investment and Credit Quality - Activity in the Allowance for Credit Losses ("ACL") by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Allowance for Loan Losses:
Beginning Balance	$ 63,584	$ 52,306
Charge offs	(3,157)	(681)
Recoveries	795	1,665
Provision	1,836	(873)
Ending Balance	63,058	52,417
Commercial & Industrial
Allowance for Loan Losses:
Beginning Balance	37,770	26,941
Charge offs	(2,823)	(152)
Recoveries	145	9
Provision	(930)	(221)
Ending Balance	34,162	26,577
Construction & Development
Allowance for Loan Losses:
Beginning Balance	3,435	5,663
Provision	667	224
Ending Balance	4,102	5,887
Commercial Real Estate
Allowance for Loan Losses:
Beginning Balance	19,068	18,148
Charge offs		(517)
Recoveries	650	1,656
Provision	1,896	(641)
Ending Balance	21,614	18,646
Commercial Land
Allowance for Loan Losses:
Beginning Balance	3,311	1,554
Charge offs	(334)	(12)
Provision	203	(235)
Ending Balance	$ 3,180	$ 1,307

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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