Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 191,251	$ 194,514
Allowance for loan losses: Cumulative effect of change in accounting principle	27,330
Allowance for loan losses: Net provision for loan losses	602,904	47,708	$ 36,116
Allowance for loan losses: Ending balance	450,177	191,251	194,514
Reserve for unfunded lending commitments: Beginning balance	3,974
Reserve for unfunded lending commitments: Provision for losses	(1,397)	3,974
Reserve for unfunded lending commitments: Ending balance	29,907	3,974
Total allowance for credit losses	480,084	195,225
Allowance for loan losses: Individually evaluated	13,880	22,385
Allowance for loan losses: Collectively evaluated	436,297	160,609
Reserve for unfunded lending commitments: Individually evaluated	241	3,974
Reserve for unfunded lending commitments: Collectively evaluated	29,666
Loans: Individually evaluated for impairment	68,144	245,651
Loans: Collectively evaluated for impairment	21,721,787	20,751,859
Loans receivable	21,789,931	21,212,755
Allowance for loan losses: Amounts related to purchased credit impaired loans		8,257
Loans: Purchased credit impaired loans		215,245
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	(409,457)	(59,077)
Allowance for loan losses: Recoveries	14,671	12,080
Allowance for loan losses: Net provision for loan losses	604,301	43,734
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	20,869	17,638
Allowance for loan losses: Cumulative effect of change in accounting principle	449
Allowance for loan losses: Ending balance	109,474	20,869	17,638
Reserve for unfunded lending commitments: Provision for losses	650
Reserve for unfunded lending commitments: Ending balance	1,099
Total allowance for credit losses	110,573	20,869
Allowance for loan losses: Individually evaluated	44	18
Allowance for loan losses: Collectively evaluated	109,430	20,812
Reserve for unfunded lending commitments: Collectively evaluated	1,099
Loans: Individually evaluated for impairment	4,542	1,898
Loans: Collectively evaluated for impairment	3,353,397	2,957,197
Loans receivable	3,357,939	2,994,448
Allowance for loan losses: Amounts related to purchased credit impaired loans		39
Loans: Purchased credit impaired loans		35,353
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	(2,512)	(32)
Allowance for loan losses: Recoveries	46	569
Allowance for loan losses: Net provision for loan losses	83,784	2,694
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	9,350	15,647
Allowance for loan losses: Cumulative effect of change in accounting principle	15,658
Allowance for loan losses: Ending balance	26,462	9,350	15,647
Reserve for unfunded lending commitments: Provision for losses	7,036
Reserve for unfunded lending commitments: Ending balance	22,694
Total allowance for credit losses	49,156	9,350
Allowance for loan losses: Individually evaluated	22	21
Allowance for loan losses: Collectively evaluated	26,440	9,193
Reserve for unfunded lending commitments: Collectively evaluated	22,694
Loans: Individually evaluated for impairment	1,250	277
Loans: Collectively evaluated for impairment	1,063,807	1,136,658
Loans receivable	1,065,057	1,157,451
Allowance for loan losses: Amounts related to purchased credit impaired loans		136
Loans: Purchased credit impaired loans		20,516
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	(400)	(7)
Allowance for loan losses: Recoveries	846	140
Allowance for loan losses: Net provision for loan losses	9,188	(6,430)
Total Commercial [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	117,409	111,509
Allowance for loan losses: Cumulative effect of change in accounting principle	6,060
Allowance for loan losses: Ending balance	218,827	117,409	111,509
Reserve for unfunded lending commitments: Beginning balance	3,974
Reserve for unfunded lending commitments: Provision for losses	(5,124)	3,974
Reserve for unfunded lending commitments: Ending balance	4,910	3,974
Total allowance for credit losses	223,737	121,383
Allowance for loan losses: Individually evaluated	12,753	21,837
Allowance for loan losses: Collectively evaluated	206,074	95,239
Reserve for unfunded lending commitments: Individually evaluated	241	3,974
Reserve for unfunded lending commitments: Collectively evaluated	4,669
Loans: Individually evaluated for impairment	53,981	236,819
Loans: Collectively evaluated for impairment	12,790,447	11,601,315
Loans receivable	12,844,428	11,905,407
Allowance for loan losses: Amounts related to purchased credit impaired loans		333
Loans: Purchased credit impaired loans		67,273
Total Commercial [Member] \| Total Commercial And Industrial [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	14,633
Allowance for loan losses: Charge-offs	(389,000)	(39,737)
Allowance for loan losses: Recoveries	6,795	7,246
Allowance for loan losses: Net provision for loan losses	468,990	38,391
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	106,432	97,752
Allowance for loan losses: Cumulative effect of change in accounting principle	5,772
Allowance for loan losses: Ending balance	149,693	106,432	97,752
Reserve for unfunded lending commitments: Beginning balance	3,974
Reserve for unfunded lending commitments: Provision for losses	(5,217)	3,974
Reserve for unfunded lending commitments: Ending balance	4,529	3,974
Total allowance for credit losses	154,222	110,406
Allowance for loan losses: Individually evaluated	11,517	21,733
Allowance for loan losses: Collectively evaluated	138,176	84,535
Reserve for unfunded lending commitments: Individually evaluated	241	3,974
Reserve for unfunded lending commitments: Collectively evaluated	4,288
Loans: Individually evaluated for impairment	43,775	232,438
Loans: Collectively evaluated for impairment	9,943,208	8,903,436
Loans receivable	9,986,983	9,166,947
Allowance for loan losses: Amounts related to purchased credit impaired loans		164
Loans: Purchased credit impaired loans		31,073
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Non-Real Estate [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	(244)
Allowance for loan losses: Charge-offs	(387,172)	(39,600)
Allowance for loan losses: Recoveries	6,032	6,940
Allowance for loan losses: Net provision for loan losses	424,645	41,340
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Real Estate Owner Occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	10,977	13,757
Allowance for loan losses: Cumulative effect of change in accounting principle	288
Allowance for loan losses: Ending balance	69,134	10,977	13,757
Reserve for unfunded lending commitments: Provision for losses	93
Reserve for unfunded lending commitments: Ending balance	381
Total allowance for credit losses	69,515	10,977
Allowance for loan losses: Individually evaluated	1,236	104
Allowance for loan losses: Collectively evaluated	67,898	10,704
Reserve for unfunded lending commitments: Collectively evaluated	381
Loans: Individually evaluated for impairment	10,206	4,381
Loans: Collectively evaluated for impairment	2,847,239	2,697,879
Loans receivable	2,857,445	2,738,460
Allowance for loan losses: Amounts related to purchased credit impaired loans		169
Loans: Purchased credit impaired loans		36,200
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Real Estate Owner Occupied \| 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	14,877
Allowance for loan losses: Charge-offs	(1,828)	(137)
Allowance for loan losses: Recoveries	763	306
Allowance for loan losses: Net provision for loan losses	44,345	(2,949)
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	20,331	23,782
Allowance for loan losses: Cumulative effect of change in accounting principle	17
Allowance for loan losses: Ending balance	48,842	20,331	23,782
Reserve for unfunded lending commitments: Provision for losses	2
Reserve for unfunded lending commitments: Ending balance	19
Total allowance for credit losses	48,861	20,331
Allowance for loan losses: Individually evaluated	546	217
Allowance for loan losses: Collectively evaluated	48,296	12,640
Reserve for unfunded lending commitments: Collectively evaluated	19
Loans: Individually evaluated for impairment	5,850	5,174
Loans: Collectively evaluated for impairment	2,659,362	2,898,700
Loans receivable	2,665,212	2,990,631
Allowance for loan losses: Amounts related to purchased credit impaired loans		7,474
Loans: Purchased credit impaired loans		86,757
Residential Portfolio Segment \| 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	(326)	(846)
Allowance for loan losses: Recoveries	1,400	480
Allowance for loan losses: Net provision for loan losses	14,516	(3,085)
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	23,292	25,938
Allowance for loan losses: Cumulative effect of change in accounting principle	5,146
Allowance for loan losses: Ending balance	46,572	23,292	$ 25,938
Reserve for unfunded lending commitments: Provision for losses	(3,961)
Reserve for unfunded lending commitments: Ending balance	1,185
Total allowance for credit losses	47,757	23,292
Allowance for loan losses: Individually evaluated	515	292
Allowance for loan losses: Collectively evaluated	46,057	22,725
Reserve for unfunded lending commitments: Collectively evaluated	1,185
Loans: Individually evaluated for impairment	2,521	1,483
Loans: Collectively evaluated for impairment	1,854,774	2,157,989
Loans receivable	1,857,295	2,164,818
Allowance for loan losses: Amounts related to purchased credit impaired loans		275
Loans: Purchased credit impaired loans		5,346
Consumer Portfolio Segment \| 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	(17,219)	(18,455)
Allowance for loan losses: Recoveries	5,584	3,645
Allowance for loan losses: Net provision for loan losses	$ 27,823	$ 12,164

Financing receivable cumulative effect of change in accounting principle.

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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 collectively evaluated for impairment.

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Reserve for unfunded lending commitments individually evaluated for Impairment.

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Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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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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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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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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Amount, before allowance for credit loss, of financing receivable.

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