Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 450,177	$ 191,251
Allowance for loan losses: Cumulative effect of change in accounting principle		27,330
Allowance for loan losses: Net provision for loan losses	(77,494)	602,904	$ 47,708
Allowance for loan losses: Ending balance	342,065	450,177	191,251
Reserve for unfunded lending commitments: Beginning balance	29,907	3,974
Reserve for unfunded lending commitments: Provision for losses	(573)	(1,397)
Reserve for unfunded lending commitments: Ending balance	29,334	29,907	3,974
Total allowance for credit losses	371,399	480,084
Allowance for loan losses: Individually evaluated	903	13,880
Allowance for loan losses: Collectively evaluated	341,162	436,297
Reserve for unfunded lending commitments: Individually evaluated		241
Reserve for unfunded lending commitments: Collectively evaluated	29,334	29,666
Loans: Individually evaluated for impairment	17,882	68,144
Loans: Collectively evaluated for impairment	21,116,400	21,721,787
Loans receivable	21,134,282	21,789,931
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		49,411
Allowance for loan losses: Charge-offs	(50,836)	(409,457)
Allowance for loan losses: Recoveries	19,645	14,671
Allowance for loan losses: Net provision for loan losses	(76,921)	604,301
Total Commercial [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	218,827	117,409
Allowance for loan losses: Cumulative effect of change in accounting principle		6,060
Allowance for loan losses: Ending balance	149,321	218,827	117,409
Reserve for unfunded lending commitments: Beginning balance	4,910	3,974
Reserve for unfunded lending commitments: Provision for losses	(65)	(5,124)
Reserve for unfunded lending commitments: Ending balance	4,845	4,910	3,974
Total allowance for credit losses	154,166	223,737
Allowance for loan losses: Individually evaluated	271	12,753
Allowance for loan losses: Collectively evaluated	149,050	206,074
Reserve for unfunded lending commitments: Individually evaluated		241
Reserve for unfunded lending commitments: Collectively evaluated	4,845	4,669
Loans: Individually evaluated for impairment	5,977	53,981
Loans: Collectively evaluated for impairment	12,427,729	12,790,447
Loans receivable	12,433,706	12,844,428
Total Commercial [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		14,633
Allowance for loan losses: Charge-offs	(36,702)	(389,000)
Allowance for loan losses: Recoveries	9,627	6,795
Allowance for loan losses: Net provision for loan losses	(42,431)	468,990
Total Commercial [Member] \| Commercial Non-Real Estate [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	149,693	106,432
Allowance for loan losses: Cumulative effect of change in accounting principle		5,772
Allowance for loan losses: Ending balance	95,888	149,693	106,432
Reserve for unfunded lending commitments: Beginning balance	4,529	3,974
Reserve for unfunded lending commitments: Provision for losses	(7)	(5,217)
Reserve for unfunded lending commitments: Ending balance	4,522	4,529	3,974
Total allowance for credit losses	100,410	154,222
Allowance for loan losses: Individually evaluated	177	11,517
Allowance for loan losses: Collectively evaluated	95,711	138,176
Reserve for unfunded lending commitments: Individually evaluated		241
Reserve for unfunded lending commitments: Collectively evaluated	4,522	4,288
Loans: Individually evaluated for impairment	3,431	43,775
Loans: Collectively evaluated for impairment	9,609,029	9,943,208
Loans receivable	9,612,460	9,986,983
Total Commercial [Member] \| Commercial Non-Real Estate [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		(244)
Allowance for loan losses: Charge-offs	(33,523)	(387,172)
Allowance for loan losses: Recoveries	8,985	6,032
Allowance for loan losses: Net provision for loan losses	(29,267)	424,645
Total Commercial [Member] \| Commercial Real Estate - Owner Occupied \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	69,134	10,977
Allowance for loan losses: Cumulative effect of change in accounting principle		288
Allowance for loan losses: Ending balance	53,433	69,134	10,977
Reserve for unfunded lending commitments: Beginning balance	381
Reserve for unfunded lending commitments: Provision for losses	(58)	93
Reserve for unfunded lending commitments: Ending balance	323	381
Total allowance for credit losses	53,756	69,515
Allowance for loan losses: Individually evaluated	94	1,236
Allowance for loan losses: Collectively evaluated	53,339	67,898
Reserve for unfunded lending commitments: Collectively evaluated	323	381
Loans: Individually evaluated for impairment	2,546	10,206
Loans: Collectively evaluated for impairment	2,818,700	2,847,239
Loans receivable	2,821,246	2,857,445
Total Commercial [Member] \| Commercial Real Estate - Owner Occupied \| Non-Purchased Credit Impaired Loans [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		14,877
Allowance for loan losses: Charge-offs	(3,179)	(1,828)
Allowance for loan losses: Recoveries	642	763
Allowance for loan losses: Net provision for loan losses	(13,164)	44,345
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	109,474	20,869
Allowance for loan losses: Cumulative effect of change in accounting principle		449
Allowance for loan losses: Ending balance	108,058	109,474	20,869
Reserve for unfunded lending commitments: Beginning balance	1,099
Reserve for unfunded lending commitments: Provision for losses	595	650
Reserve for unfunded lending commitments: Ending balance	1,694	1,099
Total allowance for credit losses	109,752	110,573
Allowance for loan losses: Individually evaluated	20	44
Allowance for loan losses: Collectively evaluated	108,038	109,430
Reserve for unfunded lending commitments: Collectively evaluated	1,694	1,099
Loans: Individually evaluated for impairment	5,288	4,542
Loans: Collectively evaluated for impairment	3,459,338	3,353,397
Loans receivable	3,464,626	3,357,939
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		7,287
Allowance for loan losses: Charge-offs	(425)	(2,512)
Allowance for loan losses: Recoveries	105	46
Allowance for loan losses: Net provision for loan losses	(1,096)	83,784
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	26,462	9,350
Allowance for loan losses: Cumulative effect of change in accounting principle		15,658
Allowance for loan losses: Ending balance	22,102	26,462	9,350
Reserve for unfunded lending commitments: Beginning balance	22,694
Reserve for unfunded lending commitments: Provision for losses	(787)	7,036
Reserve for unfunded lending commitments: Ending balance	21,907	22,694
Total allowance for credit losses	44,009	49,156
Allowance for loan losses: Individually evaluated	20	22
Allowance for loan losses: Collectively evaluated	22,082	26,440
Reserve for unfunded lending commitments: Collectively evaluated	21,907	22,694
Loans: Individually evaluated for impairment	125	1,250
Loans: Collectively evaluated for impairment	1,228,545	1,063,807
Loans receivable	1,228,670	1,065,057
Total Commercial [Member] \| Construction and Land Development [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		7,478
Allowance for loan losses: Charge-offs	(274)	(400)
Allowance for loan losses: Recoveries	2,172	846
Allowance for loan losses: Net provision for loan losses	(6,258)	9,188
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	48,842	20,331
Allowance for loan losses: Cumulative effect of change in accounting principle		17
Allowance for loan losses: Ending balance	30,623	48,842	20,331
Reserve for unfunded lending commitments: Beginning balance	19
Reserve for unfunded lending commitments: Provision for losses	3	2
Reserve for unfunded lending commitments: Ending balance	22	19
Total allowance for credit losses	30,645	48,861
Allowance for loan losses: Individually evaluated	408	546
Allowance for loan losses: Collectively evaluated	30,215	48,296
Reserve for unfunded lending commitments: Collectively evaluated	22	19
Loans: Individually evaluated for impairment	5,260	5,850
Loans: Collectively evaluated for impairment	2,418,630	2,659,362
Loans receivable	2,423,890	2,665,212
Residential Mortgages [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		12,921
Allowance for loan losses: Charge-offs	(713)	(326)
Allowance for loan losses: Recoveries	1,459	1,400
Allowance for loan losses: Net provision for loan losses	(18,965)	14,516
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	46,572	23,292
Allowance for loan losses: Cumulative effect of change in accounting principle		5,146
Allowance for loan losses: Ending balance	31,961	46,572	$ 23,292
Reserve for unfunded lending commitments: Beginning balance	1,185
Reserve for unfunded lending commitments: Provision for losses	(319)	(3,961)
Reserve for unfunded lending commitments: Ending balance	866	1,185
Total allowance for credit losses	32,827	47,757
Allowance for loan losses: Individually evaluated	184	515
Allowance for loan losses: Collectively evaluated	31,777	46,057
Reserve for unfunded lending commitments: Collectively evaluated	866	1,185
Loans: Individually evaluated for impairment	1,232	2,521
Loans: Collectively evaluated for impairment	1,582,158	1,854,774
Loans receivable	1,583,390	1,857,295
Consumer [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Cumulative effect of change in accounting principle		7,092
Allowance for loan losses: Charge-offs	(12,722)	(17,219)
Allowance for loan losses: Recoveries	6,282	5,584
Allowance for loan losses: Net provision for loan losses	$ (8,171)	$ 27,823

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Provision for losses on unfunded commitments.

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Reserve for unfunded lending commitments.

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Reserve for unfunded lending commitments individually evaluated for Impairment.

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

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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