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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	$ 16,533,403		$ 15,297,889	$ 15,351,135
Non-Graded, Recorded Investment	1,816,056		1,855,535	1,855,699
Total	18,349,459		17,153,424	17,206,834
Related Allowance [Abstract]
Internally Risk Graded, Allowance	172,982		189,412	201,362
Non-Graded, Allowance	18,697		19,053	18,263
Total	210,569	$ 215,142	230,682	247,703	$ 250,061	$ 246,159
Commercial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	11,549,529		10,706,035	10,750,657
Non-Graded, Recorded Investment	26,572		27,940	45,277
Total	11,576,101		10,733,975	10,795,934
Related Allowance [Abstract]
Internally Risk Graded, Allowance	103,185		123,383	135,846
Non-Graded, Allowance	913		886	955
Total	104,098	113,722	124,269	136,801	137,742	140,213
Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Total	3,294,867		2,930,156	2,867,981
Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Total	3,017,311		2,986,949	2,967,513
Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Total	1,650,729		1,471,256	1,658,098
Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Total	660,582		496,774	519,446
Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Total	2,437,323		2,314,753	2,239,451
Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Total	515,289		534,087	543,445
Commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	3,804,675		3,479,987	3,518,142
Non-Graded, Recorded Investment	0		0	0
Total	3,804,675		3,479,987	3,518,142
Related Allowance [Abstract]
Internally Risk Graded, Allowance	60,189		56,621	56,405
Non-Graded, Allowance	0		0	0
Total	60,189	58,758	56,621	56,405	58,580	50,749
Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Total	101,872		117,245	112,102
Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Total	759,423		691,532	725,865
Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Total	824,829		831,770	797,089
Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Total	1,120,166		980,017	999,009
Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Total	696,774		573,014	591,080
Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Total	301,611		286,409	292,997
Residential mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	262,612		234,477	226,306
Non-Graded, Recorded Investment	1,709,130		1,739,209	1,719,444
Total	1,971,742		1,973,686	1,945,750
Related Allowance [Abstract]
Internally Risk Graded, Allowance	3,099		2,947	3,068
Non-Graded, Allowance	15,584		15,504	15,325
Total	18,683	18,544	18,451	18,393	18,259	18,224
Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Total	1,094,926		1,043,435	1,013,965
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Total	180,718		197,506	187,370
Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Total	696,098		732,745	744,415
Personal [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	916,587		877,390	856,030
Non-Graded, Recorded Investment	80,354		88,386	90,978
Total	996,941		965,776	947,008
Related Allowance [Abstract]
Internally Risk Graded, Allowance	6,509		6,461	6,043
Non-Graded, Allowance	2,200		2,663	1,983
Total	8,709	8,646	9,124	8,026	8,106	8,773
Specific Allowance [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	16,533,403		15,297,889	15,351,135
Non-Graded, Recorded Investment	1,816,056		1,855,535	1,855,699
Total	18,349,459		17,153,424	17,206,834
Related Allowance [Abstract]
Internally Risk Graded, Allowance	172,982		189,412	201,362
Non-Graded, Allowance	18,697		19,053	18,263
Total	191,679		208,465	219,625
Nonspecific Allowance [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Non-Graded, Recorded Investment	0		0	0
Total	0		0	0
Related Allowance [Abstract]
Internally Risk Graded, Allowance	0		0	0
Non-Graded, Allowance	0		0	0
Total	18,890	$ 15,472	22,217	28,078	$ 27,374	$ 28,200
Performing [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	1,774,871		1,808,995	1,811,095
Performing [Member] | Commercial [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	26,511		27,870	45,132
Performing [Member] | Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	26,511		27,870	45,132
Performing [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	0		0	0
Performing [Member] | Residential mortgage [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	1,668,199		1,692,925	1,675,154
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	810,445		784,928	764,252
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	172,928		188,327	178,479
Performing [Member] | Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	684,826		719,670	732,423
Performing [Member] | Personal [Member]
Recorded Investment [Abstract]
Non-Graded, Recorded Investment	80,161		88,200	90,809
Performing [Member] | Pass [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	16,189,884		14,797,279	14,687,428
Performing [Member] | Pass [Member] | Commercial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	11,242,901		10,226,089	10,102,018
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	3,127,227		2,632,986	2,436,465
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	2,974,082		2,943,869	2,932,577
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,636,405		1,443,917	1,637,698
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	631,198		472,869	486,383
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	2,402,801		2,253,497	2,150,099
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	471,188		478,951	458,796
Performing [Member] | Pass [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	3,771,447		3,463,002	3,505,318
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	99,694		113,190	110,178
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	737,313		686,915	724,887
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	817,854		824,408	788,539
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,120,145		979,969	998,125
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	695,554		573,014	591,080
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	300,887		285,506	292,509
Performing [Member] | Pass [Member] | Residential mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	259,106		232,492	224,235
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	259,106		232,492	224,235
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Pass [Member] | Personal [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	916,430		875,696	855,857
Performing [Member] | Other Loans Especially Mentioned [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	55,727		118,175	197,952
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	46,342		103,324	188,546
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	7,233		60,288	114,065
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	27,337		13,927	26,372
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,508		19,263	9,021
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	7,265		6,653	7,181
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	2,614		3,186	31,855
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	385		7	52
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	9,338		13,303	8,964
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,828		1,828	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		4,243	689
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	6,975		7,087	8,275
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	535		145	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	393
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	393
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	47		1,548	49
Performing [Member] | Substandard [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	175,985		241,101	284,723
Performing [Member] | Substandard [Member] | Commercial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	150,857		239,389	283,338
Performing [Member] | Substandard [Member] | Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	106,374		144,598	206,768
Performing [Member] | Substandard [Member] | Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	11,795		26,533	7,390
Performing [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	3,567		5,502	9,486
Performing [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	12,917		11,290	16,823
Performing [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	16,204		43,305	33,051
Performing [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		8,161	9,820
Performing [Member] | Substandard [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	22,574		827	885
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		395	0
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	21,333		98	0
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	21		48	884
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,220		0	0
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		286	1
Performing [Member] | Substandard [Member] | Residential mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	2,520		822	462
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	2,520		822	462
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Performing [Member] | Substandard [Member] | Personal [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	34		63	38
Nonaccrual [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	111,807		141,334	181,032
Non-Graded, Recorded Investment	41,185		46,540	44,604
Nonaccrual [Member] | Commercial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	109,429		137,233	176,755
Non-Graded, Recorded Investment	61		70	145
Nonaccrual [Member] | Commercial [Member] | Energy [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	54,033		92,284	110,683
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial [Member] | Services [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	4,097		2,620	1,174
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	9,249		2,574	1,893
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	9,202		5,962	9,059
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	15,704		14,765	24,446
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	17,144		19,028	29,500
Non-Graded, Recorded Investment	61		70	145
Nonaccrual [Member] | Commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	1,316		2,855	2,975
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	350		1,832	1,924
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	777		276	289
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		275	275
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	189		472	487
Non-Graded, Recorded Investment	0		0	0
Nonaccrual [Member] | Residential mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	986		1,163	1,216
Non-Graded, Recorded Investment	40,931		46,284	44,290
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	986		1,163	1,216
Non-Graded, Recorded Investment	21,869		24,030	23,407
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Non-Graded, Recorded Investment	7,790		9,179	8,891
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	0		0	0
Non-Graded, Recorded Investment	11,272		13,075	11,992
Nonaccrual [Member] | Personal [Member]
Recorded Investment [Abstract]
Internally Risk Graded, Recorded Investment	76		83	86
Non-Graded, Recorded Investment	$ 193		$ 186	$ 169

X

- Definition

The amount of the allowance for credit losses on recorded investment, that is internally risk graded, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the recorded investment, that is internally risk graded on credit quality, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the allowance for credit losses on recorded investment that is not internally risk graded, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position.

+ References

No definition available.

+ Details

Name:	bokf_NonGradedAllowance
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of the recorded investment, for which risk grading is not used to monitor credit quality, in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. These represent small homogeneous pools primarily composed of residential and consumers as well as certain commercial loans.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

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Name:	bokf_RecordedInvestmentAbstract
Namespace Prefix:	bokf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

-- None. No documentation exists for this element. --

+ References

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

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