Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 342,065	$ 450,177
Allowance for loan losses: Net provision for loan losses	(22,527)	(4,911)
Allowance for loan losses: Ending balance	317,843	424,360
Reserve for unfunded lending commitments: Beginning balance	29,334	29,907
Reserve for unfunded lending commitments: Provision for losses	1,376	2,652
Reserve for unfunded lending commitments: Ending balance	30,710	32,559
Total allowance for credit losses	348,553	456,919
Allowance for loan losses: Individually evaluated	766	7,074
Allowance for loan losses: Collectively evaluated	317,077	417,286
Reserve for unfunded lending commitments: Individually evaluated		241
Reserve for unfunded lending commitments: Collectively evaluated	30,710	32,318
Loans: Individually evaluated for impairment	9,587	42,693
Loans: Collectively evaluated for impairment	21,313,754	21,622,166
Loans receivable	21,323,341	21,664,859	$ 21,134,282
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(5,385)	(22,104)
Allowance for loan losses: Recoveries	5,066	3,850
Allowance for loan losses: Net provision for loan losses	(23,903)	(7,563)
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	108,058	109,474
Allowance for loan losses: Ending balance	105,367	116,179
Reserve for unfunded lending commitments: Beginning balance	1,694	1,099
Reserve for unfunded lending commitments: Provision for losses	453	439
Reserve for unfunded lending commitments: Ending balance	2,147	1,538
Total allowance for credit losses	107,514	117,717
Allowance for loan losses: Individually evaluated	20	22
Allowance for loan losses: Collectively evaluated	105,347	116,157
Reserve for unfunded lending commitments: Collectively evaluated	2,147	1,538
Loans: Individually evaluated for impairment	1,309	4,363
Loans: Collectively evaluated for impairment	3,561,990	3,406,665
Loans receivable	3,563,299	3,411,028	3,464,626
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	22,102	26,462
Allowance for loan losses: Ending balance	21,088	25,173
Reserve for unfunded lending commitments: Beginning balance	21,907	22,694
Reserve for unfunded lending commitments: Provision for losses	474	(617)
Reserve for unfunded lending commitments: Ending balance	22,381	22,077
Total allowance for credit losses	43,469	47,250
Allowance for loan losses: Individually evaluated	20	21
Allowance for loan losses: Collectively evaluated	21,068	25,152
Reserve for unfunded lending commitments: Collectively evaluated	22,381	22,077
Loans: Individually evaluated for impairment	122	131
Loans: Collectively evaluated for impairment	1,286,533	1,122,010
Loans receivable	1,286,655	1,122,141	1,228,670
Total Commercial [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(4)	(194)
Allowance for loan losses: Recoveries	878
Allowance for loan losses: Net provision for loan losses	(3,565)	6,899
Total Commercial [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs		(248)
Allowance for loan losses: Recoveries	68	159
Allowance for loan losses: Net provision for loan losses	(1,082)	(1,200)
Total Commercial [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	149,321	218,827
Allowance for loan losses: Ending balance	135,760	195,459
Reserve for unfunded lending commitments: Beginning balance	4,845	4,910
Reserve for unfunded lending commitments: Provision for losses	(138)	2,773
Reserve for unfunded lending commitments: Ending balance	4,707	7,683
Total allowance for credit losses	140,467	203,142
Allowance for loan losses: Individually evaluated	144	5,806
Allowance for loan losses: Collectively evaluated	135,616	189,653
Reserve for unfunded lending commitments: Individually evaluated		241
Reserve for unfunded lending commitments: Collectively evaluated	4,707	7,442
Loans: Individually evaluated for impairment	2,693	30,179
Loans: Collectively evaluated for impairment	12,450,020	12,856,267
Loans receivable	12,452,713	12,886,446	12,433,706
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	95,888	149,693
Allowance for loan losses: Ending balance	87,299	128,936
Reserve for unfunded lending commitments: Beginning balance	4,522	4,529
Reserve for unfunded lending commitments: Provision for losses	(246)	2,642
Reserve for unfunded lending commitments: Ending balance	4,276	7,171
Total allowance for credit losses	91,575	136,107
Allowance for loan losses: Individually evaluated	112	4,564
Allowance for loan losses: Collectively evaluated	87,187	124,372
Reserve for unfunded lending commitments: Individually evaluated		190
Reserve for unfunded lending commitments: Collectively evaluated	4,276	6,981
Loans: Individually evaluated for impairment	1,742	20,132
Loans: Collectively evaluated for impairment	9,582,738	10,071,210
Loans receivable	9,584,480	10,091,342	9,612,460
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	53,433	69,134
Allowance for loan losses: Ending balance	48,461	66,523
Reserve for unfunded lending commitments: Beginning balance	323	381
Reserve for unfunded lending commitments: Provision for losses	108	131
Reserve for unfunded lending commitments: Ending balance	431	512
Total allowance for credit losses	48,892	67,035
Allowance for loan losses: Individually evaluated	32	1,242
Allowance for loan losses: Collectively evaluated	48,429	65,281
Reserve for unfunded lending commitments: Individually evaluated		51
Reserve for unfunded lending commitments: Collectively evaluated	431	461
Loans: Individually evaluated for impairment	951	10,047
Loans: Collectively evaluated for impairment	2,867,282	2,785,057
Loans receivable	2,868,233	2,795,104	2,821,246
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: Charge-offs	(2,659)	(17,859)
Allowance for loan losses: Recoveries	2,531	1,936
Allowance for loan losses: Net provision for loan losses	(13,433)	(7,445)
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(2,659)	(17,512)
Allowance for loan losses: Recoveries	2,142	1,899
Allowance for loan losses: Net provision for loan losses	(8,072)	(5,144)
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Non-Purchased Credit Impaired Loans [Member] \| Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs		(347)
Allowance for loan losses: Recoveries	389	37
Allowance for loan losses: Net provision for loan losses	(5,361)	(2,301)
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	30,623	48,842
Allowance for loan losses: Ending balance	26,335	42,519
Reserve for unfunded lending commitments: Beginning balance	22	19
Reserve for unfunded lending commitments: Provision for losses	(3)	3
Reserve for unfunded lending commitments: Ending balance	19	22
Total allowance for credit losses	26,354	42,541
Allowance for loan losses: Individually evaluated	408	486
Allowance for loan losses: Collectively evaluated	25,927	42,033
Reserve for unfunded lending commitments: Collectively evaluated	19	22
Loans: Individually evaluated for impairment	4,534	5,241
Loans: Collectively evaluated for impairment	2,458,366	2,483,551
Loans receivable	2,462,900	2,488,792	2,423,890
Residential Mortgages [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(42)	(109)
Allowance for loan losses: Recoveries	61	206
Allowance for loan losses: Net provision for loan losses	(4,307)	(6,420)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	31,961	46,572
Allowance for loan losses: Ending balance	29,293	45,030
Reserve for unfunded lending commitments: Beginning balance	866	1,185
Reserve for unfunded lending commitments: Provision for losses	590	54
Reserve for unfunded lending commitments: Ending balance	1,456	1,239
Total allowance for credit losses	30,749	46,269
Allowance for loan losses: Individually evaluated	174	739
Allowance for loan losses: Collectively evaluated	29,119	44,291
Reserve for unfunded lending commitments: Collectively evaluated	1,456	1,239
Loans: Individually evaluated for impairment	929	2,779
Loans: Collectively evaluated for impairment	1,556,845	1,753,673
Loans receivable	1,557,774	1,756,452	$ 1,583,390
Consumer [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(2,680)	(3,694)
Allowance for loan losses: Recoveries	1,528	1,549
Allowance for loan losses: Net provision for loan losses	$ (1,516)	$ 603

Provision for losses on unfunded commitments.

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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 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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