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Loans and Allowance - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses:
Beginning balance				$ 80,284				$ 80,552	$ 80,284	$ 80,552	$ 75,032
Provision for losses	$ 4,482	$ 12,544	$ 21,895	19,752	$ 500	$ 600	$ 500	1,200	58,673	2,800	7,227
Recoveries on loans									2,176	3,553	6,276
Loans charged off									(10,485)	(6,621)	(7,983)
Ending balance	130,648				80,284				130,648	80,284	80,552
Commercial
Allowance for loan losses:
Beginning balance				32,902				32,657	32,902	32,657	30,420
Provision for losses									21,930	733	2,097
Recoveries on loans									819	1,244	2,456
Loans charged off									(8,536)	(1,732)	(2,316)
Ending balance	47,115				32,902				47,115	32,902	32,657
Commercial Real Estate
Allowance for loan losses:
Beginning balance				28,778				29,609	28,778	29,609	27,343
Provision for losses									22,174	1,555	2,482
Recoveries on loans									431	1,289	2,525
Loans charged off									(313)	(3,675)	(2,741)
Ending balance	51,070				28,778				51,070	28,778	29,609
Construction
Allowance for loan losses:
Beginning balance				4,035				3,964	4,035	3,964	3,732
Provision for losses									5,996	239	679
Recoveries on loans									260	401	302
Loans charged off									(643)	(569)	(749)
Ending balance	9,648				4,035				9,648	4,035	3,964
Residential
Allowance for loan losses:
Beginning balance				$ 14,569				$ 14,322	14,569	14,322	13,537
Provision for losses									8,573	273	1,969
Recoveries on loans									666	619	993
Loans charged off									(993)	(645)	(2,177)
Ending balance	$ 22,815				$ 14,569				$ 22,815	$ 14,569	$ 14,322

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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