Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	(28,399)	(77,494)	$ 602,904
Allowance for loan losses: Ending balance	307,789	342,065	450,177
Reserve for unfunded lending commitments: Beginning balance	29,334	29,907	3,974
Reserve for unfunded lending commitments: Provision for losses	3,975	(573)
Reserve for unfunded lending commitments: Ending balance	33,309	29,334	29,907
Total allowance for credit losses	341,098	371,399
Allowance for loan losses: Individually evaluated	476	903
Allowance for loan losses: Collectively evaluated	307,313	341,162
Reserve for unfunded lending commitments: Collectively evaluated	33,309	29,334
Loans: Individually evaluated for impairment	7,515	17,882
Loans: Collectively evaluated for impairment	23,106,531	21,116,400
Total loans	23,114,046	21,134,282
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(22,590)	(50,836)
Allowance for loan losses: Recoveries	20,688	19,645
Allowance for loan losses: Net provision for loan losses	(32,374)	(76,921)
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	144,745	149,321	218,827
Reserve for unfunded lending commitments: Beginning balance	4,845	4,910
Reserve for unfunded lending commitments: Provision for losses	441	(65)
Reserve for unfunded lending commitments: Ending balance	5,286	4,845	4,910
Total allowance for credit losses	150,031	154,166
Allowance for loan losses: Individually evaluated	102	271
Allowance for loan losses: Collectively evaluated	144,643	149,050
Reserve for unfunded lending commitments: Collectively evaluated	5,286	4,845
Loans: Individually evaluated for impairment	2,168	5,977
Loans: Collectively evaluated for impairment	13,177,343	12,427,729
Total loans	13,179,511	12,433,706
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: Charge-offs	(8,585)	(36,702)
Allowance for loan losses: Recoveries	12,545	9,627
Allowance for loan losses: Net provision for loan losses	(8,536)	(42,431)
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	95,888	149,693
Allowance for loan losses: Ending balance	96,461	95,888	149,693
Reserve for unfunded lending commitments: Beginning balance	4,522	4,529
Reserve for unfunded lending commitments: Provision for losses	462	(7)
Reserve for unfunded lending commitments: Ending balance	4,984	4,522	4,529
Total allowance for credit losses	101,445	100,410
Allowance for loan losses: Individually evaluated	71	177
Allowance for loan losses: Collectively evaluated	96,390	95,711
Reserve for unfunded lending commitments: Collectively evaluated	4,984	4,522
Loans: Individually evaluated for impairment	1,248	3,431
Loans: Collectively evaluated for impairment	10,145,205	9,609,029
Total loans	10,146,453	9,612,460
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: Charge-offs	(7,637)	(33,523)
Allowance for loan losses: Recoveries	11,812	8,985
Allowance for loan losses: Net provision for loan losses	(3,602)	(29,267)
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	53,433	69,134
Allowance for loan losses: Ending balance	48,284	53,433	69,134
Reserve for unfunded lending commitments: Beginning balance	323	381
Reserve for unfunded lending commitments: Provision for losses	(21)	(58)
Reserve for unfunded lending commitments: Ending balance	302	323	381
Total allowance for credit losses	48,586	53,756
Allowance for loan losses: Individually evaluated	31	94
Allowance for loan losses: Collectively evaluated	48,253	53,339
Reserve for unfunded lending commitments: Collectively evaluated	302	323
Loans: Individually evaluated for impairment	920	2,546
Loans: Collectively evaluated for impairment	3,032,138	2,818,700
Total loans	3,033,058	2,821,246
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: Charge-offs	(948)	(3,179)
Allowance for loan losses: Recoveries	733	642
Allowance for loan losses: Net provision for loan losses	(4,934)	(13,164)
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	71,961	108,058	109,474
Reserve for unfunded lending commitments: Beginning balance	1,694	1,099
Reserve for unfunded lending commitments: Provision for losses	(299)	595
Reserve for unfunded lending commitments: Ending balance	1,395	1,694	1,099
Total allowance for credit losses	73,356	109,752
Allowance for loan losses: Individually evaluated	16	20
Allowance for loan losses: Collectively evaluated	71,945	108,038
Reserve for unfunded lending commitments: Collectively evaluated	1,395	1,694
Loans: Individually evaluated for impairment	1,240	5,288
Loans: Collectively evaluated for impairment	3,559,751	3,459,338
Total loans	3,560,991	3,464,626
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: Charge-offs	(1,073)	(425)
Allowance for loan losses: Recoveries	878	105
Allowance for loan losses: Net provision for loan losses	(35,902)	(1,096)
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	30,498	22,102	26,462
Reserve for unfunded lending commitments: Beginning balance	21,907	22,694
Reserve for unfunded lending commitments: Provision for losses	3,203	(787)
Reserve for unfunded lending commitments: Ending balance	25,110	21,907	22,694
Total allowance for credit losses	55,608	44,009
Allowance for loan losses: Individually evaluated	18	20
Allowance for loan losses: Collectively evaluated	30,480	22,082
Reserve for unfunded lending commitments: Collectively evaluated	25,110	21,907
Loans: Individually evaluated for impairment	116	125
Loans: Collectively evaluated for impairment	1,703,476	1,228,545
Total loans	1,703,592	1,228,670
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: Charge-offs	(3)	(274)
Allowance for loan losses: Recoveries	134	2,172
Allowance for loan losses: Net provision for loan losses	8,265	(6,258)
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	32,464	30,623	48,842
Reserve for unfunded lending commitments: Beginning balance	22	19
Reserve for unfunded lending commitments: Provision for losses	9	3
Reserve for unfunded lending commitments: Ending balance	31	22	19
Total allowance for credit losses	32,495	30,645
Allowance for loan losses: Individually evaluated	239	408
Allowance for loan losses: Collectively evaluated	32,225	30,215
Reserve for unfunded lending commitments: Collectively evaluated	31	22
Loans: Individually evaluated for impairment	3,476	5,260
Loans: Collectively evaluated for impairment	3,089,129	2,418,630
Total loans	3,092,605	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	(137)	(713)
Allowance for loan losses: Recoveries	1,749	1,459
Allowance for loan losses: Net provision for loan losses	229	(18,965)
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	28,121	31,961	46,572
Reserve for unfunded lending commitments: Beginning balance	866	1,185
Reserve for unfunded lending commitments: Provision for losses	621	(319)
Reserve for unfunded lending commitments: Ending balance	1,487	866	$ 1,185
Total allowance for credit losses	29,608	32,827
Allowance for loan losses: Individually evaluated	101	184
Allowance for loan losses: Collectively evaluated	28,020	31,777
Reserve for unfunded lending commitments: Collectively evaluated	1,487	866
Loans: Individually evaluated for impairment	515	1,232
Loans: Collectively evaluated for impairment	1,576,832	1,582,158
Total loans	1,577,347	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	(12,792)	(12,722)
Allowance for loan losses: Recoveries	5,382	6,282
Allowance for loan losses: Net provision for loan losses	$ 3,570	$ (8,171)

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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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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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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