Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Allowance for credit losses on loans and leases
Balance, beginning of period	$ 328,401	$ 157,629
Provision for credit losses for loans and leases	(35,132)	191,875
Charge-offs	(59,297)	(84,496)
Recoveries	14,440	13,394
Net recoveries (charge-offs)	(44,857)	(71,102)
Balance, end of period	248,412	328,401
Reserve for unfunded commitments
Balance, beginning of period	20,286	5,106
Provision (recapture) for credit losses on unfunded commitments (1)	(7,519)	11,942
Balance, end of period	12,767	20,286
Total allowance for credit losses	261,179	348,687
Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans and leases
Balance, beginning of period		49,999
Reserve for unfunded commitments
Balance, beginning of period		3,238
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for credit losses on loans and leases
Balance, beginning of period		207,628
Reserve for unfunded commitments
Balance, beginning of period		8,344
Commercial Real Estate
Allowance for credit losses on loans and leases
Balance, beginning of period	141,710	50,847
Provision for credit losses for loans and leases	(42,136)	86,186
Charge-offs	(1,144)	(1,413)
Recoveries	645	1,013
Net recoveries (charge-offs)	(499)	(400)
Balance, end of period	99,075	141,710
Reserve for unfunded commitments
Balance, beginning of period	15,360	534
Provision (recapture) for credit losses on unfunded commitments (1)	(6,899)	10,796
Balance, end of period	8,461	15,360
Total allowance for credit losses	107,536	157,070
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans and leases
Balance, beginning of period		5,077
Reserve for unfunded commitments
Balance, beginning of period		4,030
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for credit losses on loans and leases
Balance, beginning of period		55,924
Reserve for unfunded commitments
Balance, beginning of period		4,564
Commercial
Allowance for credit losses on loans and leases
Balance, beginning of period	150,864	73,820
Provision for credit losses for loans and leases	10,431	101,478
Charge-offs	(54,425)	(76,488)
Recoveries	10,703	8,045
Net recoveries (charge-offs)	(43,722)	(68,443)
Balance, end of period	117,573	150,864
Reserve for unfunded commitments
Balance, beginning of period	2,190	2,539
Provision (recapture) for credit losses on unfunded commitments (1)	(162)	138
Balance, end of period	2,028	2,190
Total allowance for credit losses	119,601	153,054
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans and leases
Balance, beginning of period		44,009
Reserve for unfunded commitments
Balance, beginning of period		(487)
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for credit losses on loans and leases
Balance, beginning of period		117,829
Reserve for unfunded commitments
Balance, beginning of period		2,052
Residential
Allowance for credit losses on loans and leases
Balance, beginning of period	27,964	24,714
Provision for credit losses for loans and leases	250	(190)
Charge-offs	(70)	(521)
Recoveries	924	1,862
Net recoveries (charge-offs)	854	1,341
Balance, end of period	29,068	27,964
Reserve for unfunded commitments
Balance, beginning of period	1,661	149
Provision (recapture) for credit losses on unfunded commitments (1)	296	245
Balance, end of period	1,957	1,661
Total allowance for credit losses	31,025	29,625
Residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans and leases
Balance, beginning of period		2,099
Reserve for unfunded commitments
Balance, beginning of period		1,267
Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for credit losses on loans and leases
Balance, beginning of period		26,813
Reserve for unfunded commitments
Balance, beginning of period		1,416
Consumer & Other, Net
Allowance for credit losses on loans and leases
Balance, beginning of period	7,863	8,248
Provision for credit losses for loans and leases	(3,677)	4,401
Charge-offs	(3,658)	(6,074)
Recoveries	2,168	2,474
Net recoveries (charge-offs)	(1,490)	(3,600)
Balance, end of period	2,696	7,863
Reserve for unfunded commitments
Balance, beginning of period	1,075	1,884
Provision (recapture) for credit losses on unfunded commitments (1)	(754)	763
Balance, end of period	321	1,075
Total allowance for credit losses	$ 3,017	8,938
Consumer & Other, Net | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans and leases
Balance, beginning of period		(1,186)
Reserve for unfunded commitments
Balance, beginning of period		(1,572)
Consumer & Other, Net | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for credit losses on loans and leases
Balance, beginning of period		7,062
Reserve for unfunded commitments
Balance, beginning of period		$ 312