Loans and Allowance for Credit Losses - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses:
Beginning balance	[1]	$ 130,648
Provision for credit losses		0
Recoveries on loans		2,578
Loans charged off		(11,884)
Ending balance	[1]	195,397	$ 130,648
Beginning balance		130,648	80,284	$ 80,552
Provision for credit losses - loans		0	58,673	2,800
Recoveries on loans			2,176	3,553
Allowance for Loan and Lease Losses, Write-offs			(10,485)	(6,621)
Ending balance			130,648	80,284
Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		74,055
Ending balance			74,055
Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		204,703
Ending balance			204,703
Previously Reported
Allowance for loan losses:
Beginning balance		130,648
Ending balance			130,648
Credit risk reclassifications
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Commercial
Allowance for loan losses:
Beginning balance		47,115
Provision for credit losses		7,921
Recoveries on loans		724
Loans charged off		(5,849)
Ending balance		69,935	47,115
Beginning balance		47,115	32,902	32,657
Provision for credit losses - loans			21,930	733
Recoveries on loans			819	1,244
Allowance for Loan and Lease Losses, Write-offs			(8,536)	(1,732)
Ending balance			47,115	32,902
Commercial | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		20,024
Ending balance			20,024
Commercial | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		67,139
Ending balance			67,139
Commercial | Previously Reported
Allowance for loan losses:
Beginning balance		47,115
Ending balance			47,115
Commercial | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Commercial Real Estate
Allowance for loan losses:
Beginning balance		40,786
Provision for credit losses		(11,093)
Recoveries on loans		580
Loans charged off		(4,533)
Ending balance		60,665	40,786
Beginning balance		51,070	28,778	29,609
Provision for credit losses - loans			22,174	1,555
Recoveries on loans			431	1,289
Allowance for Loan and Lease Losses, Write-offs			(313)	(3,675)
Ending balance			51,070	28,778
Commercial Real Estate | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		34,925
Ending balance			34,925
Commercial Real Estate | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		75,711
Ending balance			75,711
Commercial Real Estate | Previously Reported
Allowance for loan losses:
Beginning balance		51,070
Ending balance			51,070
Commercial Real Estate | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		(10,284)
Ending balance			(10,284)
Construction
Allowance for loan losses:
Beginning balance		10,284
Provision for credit losses		1,122
Recoveries on loans		1
Loans charged off		(6)
Ending balance		20,206	10,284
Construction | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		8,805
Ending balance			8,805
Construction | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		19,089
Ending balance			19,089
Construction | Previously Reported
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Construction | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		10,284
Ending balance			10,284
Consumer
Allowance for loan losses:
Beginning balance		0
Provision for credit losses		0
Recoveries on loans		0
Loans charged off		0
Ending balance		0	0
Beginning balance		9,648	4,035	3,964
Provision for credit losses - loans			5,996	239
Recoveries on loans			260	401
Allowance for Loan and Lease Losses, Write-offs			(643)	(569)
Ending balance			9,648	4,035
Consumer | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Consumer | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Consumer | Previously Reported
Allowance for loan losses:
Beginning balance		9,648
Ending balance			9,648
Consumer | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		(9,648)
Ending balance			(9,648)
Residential
Allowance for loan losses:
Beginning balance		0
Provision for credit losses		0
Recoveries on loans		0
Loans charged off		0
Ending balance		0	0
Beginning balance		22,815	14,569	14,322
Provision for credit losses - loans			8,573	273
Recoveries on loans			666	619
Allowance for Loan and Lease Losses, Write-offs			(993)	(645)
Ending balance			22,815	$ 14,569
Residential | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Residential | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Residential | Previously Reported
Allowance for loan losses:
Beginning balance		22,815
Ending balance			22,815
Residential | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		(22,815)
Ending balance			(22,815)
Consumer & Residential
Allowance for loan losses:
Beginning balance		32,463
Provision for credit losses		2,050
Recoveries on loans		1,273
Loans charged off		(1,496)
Ending balance		44,591	32,463
Consumer & Residential | Impact of adopting ASC 326
Allowance for loan losses:
Beginning balance		10,301
Ending balance			10,301
Consumer & Residential | Balances, January 1, 2021 Post-ASC 326 adoption
Allowance for loan losses:
Beginning balance		42,764
Ending balance			42,764
Consumer & Residential | Previously Reported
Allowance for loan losses:
Beginning balance		0
Ending balance			0
Consumer & Residential | Credit risk reclassifications
Allowance for loan losses:
Beginning balance		$ 32,463
Ending balance			$ 32,463

[1] Beginning January 1, 2021, the amount is based on the current expected credit loss methodology. Prior to January 1, 2021, the amount is based on the incurred loss methodology. See additional details in NOTE 1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES of these Notes to Consolidated Financial Statements.