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 cumulative effect of change in accounting principle.

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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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- Definition

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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- Definition

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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No definition available.

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

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually 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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Amount, before allowance for credit loss, of financing receivable.

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Amount of expense related to estimated loss from loan and lease transactions.

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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			$ 191,251	$ 194,514
Allowance for loan losses: Net provision for loan losses	$ 306,898	$ 8,088	553,691	26,131
Allowance for loan losses: Ending balance	442,638	195,625	442,638	195,625
Reserve for unfunded lending commitments: Beginning balance			3,974
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			27,330
Reserve for unfunded lending commitments: Provision for losses			5,267
Reserve for unfunded lending commitments: Ending balance	36,571		36,571
Total allowance for credit losses	479,209		479,209		$ 271,966	$ 195,225
Allowance for loan losses: Individually evaluated	15,222	9,121	15,222	9,121
Allowance for loan losses: Amounts related to purchased credit impaired loans		9,574		9,574
Allowance for loan losses: Collectively evaluated	427,416	176,930	427,416	176,930
Reserve for unfunded lending commitments: Individually evaluated	751		751
Reserve for unfunded lending commitments: Collectively evaluated	35,820		35,820
Loans: Individually evaluated	116,205	249,881	116,205	249,881
Loans: Purchased credit impaired loans		119,994		119,994
Purchased credit impaired loans	22,512,172	19,805,937	22,512,172	19,805,937
Loans receivable	22,628,377	20,175,812	22,628,377	20,175,812		21,212,755
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			(353,655)	(30,340)
Allowance for loan losses: Recoveries			7,207	5,320
Allowance for loan losses: Net provision for loan losses			548,424	26,131
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: Ending balance	97,911	25,411	97,911	25,411
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			449
Reserve for unfunded lending commitments: Provision for losses			649
Reserve for unfunded lending commitments: Ending balance	1,098		1,098
Total allowance for credit losses	99,009		99,009
Allowance for loan losses: Individually evaluated	457	93	457	93
Allowance for loan losses: Amounts related to purchased credit impaired loans		105		105
Allowance for loan losses: Collectively evaluated	97,454	25,213	97,454	25,213
Reserve for unfunded lending commitments: Collectively evaluated	1,098		1,098
Loans: Individually evaluated	6,222	1,880	6,222	1,880
Loans: Purchased credit impaired loans		4,702		4,702
Purchased credit impaired loans	3,344,077	2,888,886	3,344,077	2,888,886
Loans receivable	3,350,299	2,895,468	3,350,299	2,895,468		2,994,448
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: Ending balance	31,239	11,665	31,239	11,665
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			15,658
Reserve for unfunded lending commitments: Provision for losses			10,455
Reserve for unfunded lending commitments: Ending balance	26,113		26,113
Total allowance for credit losses	57,352		57,352
Allowance for loan losses: Individually evaluated	55	1	55	1
Allowance for loan losses: Amounts related to purchased credit impaired loans		151		151
Allowance for loan losses: Collectively evaluated	31,184	11,513	31,184	11,513
Reserve for unfunded lending commitments: Collectively evaluated	26,113		26,113
Loans: Individually evaluated	1,007	19	1,007	19
Loans: Purchased credit impaired loans		1,482		1,482
Purchased credit impaired loans	1,127,952	1,142,561	1,127,952	1,142,561
Loans receivable	1,128,959	1,144,062	1,128,959	1,144,062		1,157,451
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: Cumulative effect of change in accounting principle			7,287
Allowance for loan losses: Charge-offs			(1,501)	(10)
Allowance for loan losses: Recoveries			46	2
Allowance for loan losses: Net provision for loan losses			71,210	7,781
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: Cumulative effect of change in accounting principle			7,478
Allowance for loan losses: Charge-offs			(5)
Allowance for loan losses: Recoveries			451	97
Allowance for loan losses: Net provision for loan losses			13,965	(4,079)
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: Ending balance	206,437	110,762	206,437	110,762
Reserve for unfunded lending commitments: Beginning balance			3,974
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			6,060
Reserve for unfunded lending commitments: Provision for losses			(2,473)
Reserve for unfunded lending commitments: Ending balance	7,561		7,561
Total allowance for credit losses	213,998		213,998
Allowance for loan losses: Individually evaluated	13,856	8,628	13,856	8,628
Allowance for loan losses: Amounts related to purchased credit impaired loans		310		310
Allowance for loan losses: Collectively evaluated	192,581	101,824	192,581	101,824
Reserve for unfunded lending commitments: Individually evaluated	751		751
Reserve for unfunded lending commitments: Collectively evaluated	6,810		6,810
Loans: Individually evaluated	99,296	242,372	99,296	242,372
Loans: Purchased credit impaired loans		11,894		11,894
Purchased credit impaired loans	13,128,243	10,824,822	13,128,243	10,824,822
Loans receivable	13,227,539	11,079,088	13,227,539	11,079,088		11,905,407
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: Ending balance	144,971	96,527	144,971	96,527
Reserve for unfunded lending commitments: Beginning balance			3,974
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			5,772
Reserve for unfunded lending commitments: Provision for losses			(2,900)
Reserve for unfunded lending commitments: Ending balance	6,846		6,846
Total allowance for credit losses	151,817		151,817
Allowance for loan losses: Individually evaluated	12,619	8,486	12,619	8,486
Allowance for loan losses: Amounts related to purchased credit impaired loans		138		138
Allowance for loan losses: Collectively evaluated	132,352	87,903	132,352	87,903
Reserve for unfunded lending commitments: Individually evaluated	751		751
Reserve for unfunded lending commitments: Collectively evaluated	6,095		6,095
Loans: Individually evaluated	89,314	224,603	89,314	224,603
Loans: Purchased credit impaired loans		6,313		6,313
Purchased credit impaired loans	10,375,966	8,328,202	10,375,966	8,328,202
Loans receivable	10,465,280	8,559,118	10,465,280	8,559,118		9,166,947
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			10,977	13,757
Allowance for loan losses: Ending balance	61,466	14,235	61,466	14,235
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			288
Reserve for unfunded lending commitments: Provision for losses			427
Reserve for unfunded lending commitments: Ending balance	715		715
Total allowance for credit losses	62,181		62,181
Allowance for loan losses: Individually evaluated	1,237	142	1,237	142
Allowance for loan losses: Amounts related to purchased credit impaired loans		172		172
Allowance for loan losses: Collectively evaluated	60,229	13,921	60,229	13,921
Reserve for unfunded lending commitments: Collectively evaluated	715		715
Loans: Individually evaluated	9,982	17,769	9,982	17,769
Loans: Purchased credit impaired loans		5,581		5,581
Purchased credit impaired loans	2,752,277	2,496,620	2,752,277	2,496,620
Loans receivable	2,762,259	2,519,970	2,762,259	2,519,970		2,738,460
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			(341,272)	(21,724)
Allowance for loan losses: Recoveries			3,406	2,951
Allowance for loan losses: Net provision for loan losses			412,261	18,026
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: Cumulative effect of change in accounting principle			(244)
Allowance for loan losses: Charge-offs			(339,566)	(21,653)
Allowance for loan losses: Recoveries			3,299	2,730
Allowance for loan losses: Net provision for loan losses			375,050	17,698
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: Cumulative effect of change in accounting principle			14,877
Allowance for loan losses: Charge-offs			(1,706)	(71)
Allowance for loan losses: Recoveries			107	221
Allowance for loan losses: Net provision for loan losses			37,211	328
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			20,331	23,782
Allowance for loan losses: Ending balance	57,351	23,058	57,351	23,058
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			17
Reserve for unfunded lending commitments: Provision for losses			5
Reserve for unfunded lending commitments: Ending balance	22		22
Total allowance for credit losses	57,373		57,373
Allowance for loan losses: Individually evaluated	477	146	477	146
Allowance for loan losses: Amounts related to purchased credit impaired loans		8,695		8,695
Allowance for loan losses: Collectively evaluated	56,874	14,217	56,874	14,217
Reserve for unfunded lending commitments: Collectively evaluated	22		22
Loans: Individually evaluated	5,710	4,089	5,710	4,089
Loans: Purchased credit impaired loans		98,472		98,472
Purchased credit impaired loans	2,871,606	2,865,710	2,871,606	2,865,710
Loans receivable	2,877,316	2,968,271	2,877,316	2,968,271		2,990,631
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			(141)	(439)
Allowance for loan losses: Recoveries			761	266
Allowance for loan losses: Net provision for loan losses			23,479	(551)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			23,292	25,938
Allowance for loan losses: Ending balance	49,700	24,729	49,700	24,729
Reserve for unfunded lending commitments: Cumulative effect of change in accounting principle			5,146
Reserve for unfunded lending commitments: Provision for losses			(3,369)
Reserve for unfunded lending commitments: Ending balance	1,777		1,777
Total allowance for credit losses	51,477		51,477
Allowance for loan losses: Individually evaluated	377	253	377	253
Allowance for loan losses: Amounts related to purchased credit impaired loans		313		313
Allowance for loan losses: Collectively evaluated	49,323	24,163	49,323	24,163
Reserve for unfunded lending commitments: Collectively evaluated	1,777		1,777
Loans: Individually evaluated	3,970	1,521	3,970	1,521
Loans: Purchased credit impaired loans		3,444		3,444
Purchased credit impaired loans	2,040,294	2,083,958	2,040,294	2,083,958
Loans receivable	$ 2,044,264	$ 2,088,923	2,044,264	2,088,923		$ 2,164,818
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			(10,736)	(8,167)
Allowance for loan losses: Recoveries			2,543	2,004
Allowance for loan losses: Net provision for loan losses			$ 27,509	$ 4,954