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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing receivable, recorded investment, aging [Abstract]
Current	$ 18,041,031	$ 16,770,208	$ 16,803,397
Nonaccrual	152,992	187,874	225,636
Total	18,349,459	17,153,424	17,206,834
Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	11,456,186	10,575,384	10,606,851
Nonaccrual	109,490	137,303	176,900
Total	11,576,101	10,733,975	10,795,934
Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,240,684	2,833,668	2,752,259
Nonaccrual	54,033	92,284	110,683
Total	3,294,867	2,930,156	2,867,981
Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,006,581	2,983,222	2,963,746
Nonaccrual	4,097	2,620	1,174
Total	3,017,311	2,986,949	2,967,513
Commercial [Member] | Wholesale/retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,641,447	1,468,284	1,654,018
Nonaccrual	9,249	2,574	1,893
Total	1,650,729	1,471,256	1,658,098
Commercial [Member] | Manufacturing [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	648,242	490,739	508,231
Nonaccrual	9,202	5,962	9,059
Total	660,582	496,774	519,446
Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	2,421,166	2,284,770	2,214,849
Nonaccrual	15,704	14,765	24,446
Total	2,437,323	2,314,753	2,239,451
Commercial [Member] | Other commercial and industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	498,066	514,701	513,748
Nonaccrual	17,205	19,098	29,645
Total	515,289	534,087	543,445
Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,802,050	3,476,163	3,513,942
Nonaccrual	1,316	2,855	2,975
Total	3,804,675	3,479,987	3,518,142
Commercial real estate [Member] | Residential construction and land development [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	101,185	115,213	109,994
Nonaccrual	350	1,832	1,924
Total	101,872	117,245	112,102
Commercial real estate [Member] | Retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	758,646	691,256	724,850
Nonaccrual	777	276	289
Total	759,423	691,532	725,865
Commercial real estate [Member] | Office [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	824,829	831,118	796,687
Nonaccrual	0	275	275
Total	824,829	831,770	797,089
Commercial real estate [Member] | Multifamily [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,120,166	979,625	999,009
Nonaccrual	0	0	0
Total	1,120,166	980,017	999,009
Commercial real estate [Member] | Industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	696,774	573,014	591,080
Nonaccrual	0	0	0
Total	696,774	573,014	591,080
Commercial real estate [Member] | Other commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	300,450	285,937	292,322
Nonaccrual	189	472	487
Total	301,611	286,409	292,997
Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,787,081	1,754,287	1,739,236
Nonaccrual	41,917	47,447	45,506
Total	1,971,742	1,973,686	1,945,750
Residential mortgage [Member] | Permanent mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,064,618	1,014,588	985,183
Nonaccrual	22,855	25,193	24,623
Total	1,094,926	1,043,435	1,013,965
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	39,523	22,692	25,169
Nonaccrual	7,790	9,179	8,891
Total	180,718	197,506	187,370
Residential mortgage [Member] | Home equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	682,940	717,007	728,884
Nonaccrual	11,272	13,075	11,992
Total	696,098	732,745	744,415
Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	995,714	964,374	943,368
Nonaccrual	269	269	255
Total	996,941	965,776	947,008
30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	41,167	41,991	32,750
30 to 59 Days [Member] | Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	8,700	16,215	4,299
30 to 59 Days [Member] | Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	150	0	0
30 to 59 Days [Member] | Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	4,908	514	2,343
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	33	398	1,748
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	3,138	0	0
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	453	15,218	156
30 to 59 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	18	85	52
30 to 59 Days [Member] | Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	867	476	1,038
30 to 59 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	337	200	184
30 to 59 Days [Member] | Commercial real estate [Member] | Retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	726
30 to 59 Days [Member] | Commercial real estate [Member] | Office [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	254	127
30 to 59 Days [Member] | Commercial real estate [Member] | Multifamily [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	22	0
30 to 59 Days [Member] | Commercial real estate [Member] | Industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
30 to 59 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	530	0	1
30 to 59 Days [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	30,700	24,619	24,117
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	5,721	3,435	3,705
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	23,370	18,978	17,346
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,609	2,206	3,066
30 to 59 Days [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	900	681	3,296
60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	17,469	19,529	22,177
60 to 89 Days [Member] | Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,725	4,841	7,854
60 to 89 Days [Member] | Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	4,204	5,039
60 to 89 Days [Member] | Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,725	486	250
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	409
60 to 89 Days [Member] | Commercial [Member] | Manufacturing [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	73	2,156
60 to 89 Days [Member] | Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
60 to 89 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	78	0
60 to 89 Days [Member] | Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	45	370	0
60 to 89 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
60 to 89 Days [Member] | Commercial real estate [Member] | Retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
60 to 89 Days [Member] | Commercial real estate [Member] | Office [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
60 to 89 Days [Member] | Commercial real estate [Member] | Multifamily [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	370	0
60 to 89 Days [Member] | Commercial real estate [Member] | Industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
60 to 89 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	45	0	0
60 to 89 Days [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	15,641	14,127	14,242
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,732	219	454
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	13,753	13,468	13,343
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	156	440	445
60 to 89 Days [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	58	191	81
90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	96,800	133,822	122,874
90 Days or More [Member] | Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	232	30
90 Days or More [Member] | Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	107	0
90 Days or More [Member] | Commercial [Member] | Wholesale/retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	30
90 Days or More [Member] | Commercial [Member] | Manufacturing [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial [Member] | Other commercial and industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	125	0
90 Days or More [Member] | Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	397	123	187
90 Days or More [Member] | Commercial real estate [Member] | Residential construction and land development [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial real estate [Member] | Retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial real estate [Member] | Office [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	123	0
90 Days or More [Member] | Commercial real estate [Member] | Multifamily [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial real estate [Member] | Industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Commercial real estate [Member] | Other commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	397	0	187
90 Days or More [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	96,403	133,206	122,649
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0	0
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	96,282	133,189	122,621
90 Days or More [Member] | Residential mortgage [Member] | Home equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	121	17	28
90 Days or More [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	$ 0	$ 261	$ 8

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