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Loans and Allowance for Loan Losses (Allowance for Loan Losses by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			$ 229,418	$ 181,179
Allowance for loan losses: Net provision for loan losses	$ 13,040	$ 18,972	43,982	96,204
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,526)	(3,027)
Allowance for loan losses: Ending balance	223,122	236,061	223,122	236,061
Allowance for loan losses: Individually evaluated for impairment	23,490	21,130	23,490	21,130
Allowance for loan losses: Amounts related to purchased credit impaired loans	15,312	19,708	15,312	19,708
Allowance for loan losses: Collectively evaluated for impairment	184,320	195,223	184,320	195,223
Loans: Individually evaluated for impairment	302,397	256,563	302,397	256,563
Loans: Purchased credit impaired loans	176,111	201,792	176,111	201,792	$ 190,915	$ 225,838
Loans: Collectively evaluated for impairment	18,307,777	15,612,466	18,307,777	15,612,466
Loans receivable	18,786,285	16,070,821	18,786,285	16,070,821	16,752,151
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	14,090,299		14,090,299		12,545,507
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			13,509	6,041
Allowance for loan losses: Ending balance	14,490	10,950	14,490	10,950
Allowance for loan losses: Individually evaluated for impairment	1,321	57	1,321	57
Allowance for loan losses: Amounts related to purchased credit impaired loans	199	279	199	279
Allowance for loan losses: Collectively evaluated for impairment	12,970	10,614	12,970	10,614
Loans: Individually evaluated for impairment	14,295	7,655	14,295	7,655
Loans: Purchased credit impaired loans	5,353	8,087	5,353	8,087
Loans: Collectively evaluated for impairment	2,492,160	1,974,567	2,492,160	1,974,567
Loans receivable	2,511,808	1,990,309	2,511,808	1,990,309	2,013,890
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			6,271	5,642
Allowance for loan losses: Ending balance	6,581	5,848	6,581	5,848
Allowance for loan losses: Individually evaluated for impairment	1	6	1	6
Allowance for loan losses: Amounts related to purchased credit impaired loans	254	484	254	484
Allowance for loan losses: Collectively evaluated for impairment	6,326	5,358	6,326	5,358
Loans: Individually evaluated for impairment	480	2,062	480	2,062
Loans: Purchased credit impaired loans	6,670	8,436	6,670	8,436
Loans: Collectively evaluated for impairment	1,365,898	936,094	1,365,898	936,094
Loans receivable	1,373,048	946,592	1,373,048	946,592	1,010,879
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			25,361	25,353
Allowance for loan losses: Ending balance	25,034	24,192	25,034	24,192
Allowance for loan losses: Individually evaluated for impairment	406	94	406	94
Allowance for loan losses: Amounts related to purchased credit impaired loans	12,795	15,949	12,795	15,949
Allowance for loan losses: Collectively evaluated for impairment	11,833	8,149	11,833	8,149
Loans: Individually evaluated for impairment	8,942	3,864	8,942	3,864
Loans: Purchased credit impaired loans	123,244	145,273	123,244	145,273
Loans: Collectively evaluated for impairment	2,464,506	1,888,025	2,464,506	1,888,025
Loans receivable	2,596,692	2,037,162	2,596,692	2,037,162	2,146,713
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			26,142	24,857
Allowance for loan losses: Ending balance	29,363	25,027	29,363	25,027
Allowance for loan losses: Individually evaluated for impairment	405	85	405	85
Allowance for loan losses: Amounts related to purchased credit impaired loans	863	1,334	863	1,334
Allowance for loan losses: Collectively evaluated for impairment	28,095	23,608	28,095	23,608
Loans: Individually evaluated for impairment	1,306	1,485	1,306	1,485
Loans: Purchased credit impaired loans	7,637	12,045	7,637	12,045
Loans: Collectively evaluated for impairment	2,090,351	2,047,475	2,090,351	2,047,475
Loans receivable	2,099,294	2,061,005	2,099,294	2,061,005	2,059,931
Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(332)	(146)
Allowance for loan losses: Recoveries			259	484
Allowance for loan losses: Net provision for loan losses			(442)	(723)
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,526)	(3,027)
Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs				(1)
Allowance for loan losses: Recoveries				2
Allowance for loan losses: Net provision for loan losses			(54)	(436)
Allowance for loan losses: Decrease in FDIC loss share receivable
Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(77)	(18)
Allowance for loan losses: Recoveries			49	98
Allowance for loan losses: Net provision for loan losses			(124)	(253)
Allowance for loan losses: Decrease in FDIC loss share receivable
Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(102)	(91)
Allowance for loan losses: Recoveries			23	33
Allowance for loan losses: Net provision for loan losses			175	1,685
Allowance for loan losses: Decrease in FDIC loss share receivable			(2,344)	(3,341)
Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(153)	(8)
Allowance for loan losses: Recoveries			72	112
Allowance for loan losses: Net provision for loan losses			(192)	(1,633)
Allowance for loan losses: Decrease in FDIC loss share receivable			(135)	316
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(61,601)	(48,493)
Allowance for loan losses: Recoveries			13,922	9,860
Allowance for loan losses: Net provision for loan losses			44,424	96,927
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(160)	(191)
Allowance for loan losses: Recoveries			655	673
Allowance for loan losses: Net provision for loan losses			540	4,862
Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(593)	(827)
Allowance for loan losses: Recoveries			1,001	1,422
Allowance for loan losses: Net provision for loan losses			54	(216)
Non-Purchased Credit Impaired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(2,383)	(908)
Allowance for loan losses: Recoveries			316	497
Allowance for loan losses: Net provision for loan losses			3,988	964
Non-Purchased Credit Impaired Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(22,691)	(17,403)
Allowance for loan losses: Recoveries			5,176	4,272
Allowance for loan losses: Net provision for loan losses			21,144	14,514
Total Commercial & Industrial [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			158,135	119,286
Allowance for loan losses: Ending balance	147,654	170,044	147,654	170,044
Allowance for loan losses: Individually evaluated for impairment	21,357	20,888	21,357	20,888
Allowance for loan losses: Amounts related to purchased credit impaired loans	1,201	1,662	1,201	1,662
Allowance for loan losses: Collectively evaluated for impairment	125,096	147,494	125,096	147,494
Loans: Individually evaluated for impairment	277,375	241,497	277,375	241,497
Loans: Purchased credit impaired loans	33,207	27,951	33,207	27,951
Loans: Collectively evaluated for impairment	9,894,861	8,766,305	9,894,861	8,766,305
Loans receivable	10,205,443	9,035,753	10,205,443	9,035,753	9,520,738
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			147,052	109,428
Allowance for loan losses: Ending balance	134,095	159,261	134,095	159,261
Allowance for loan losses: Individually evaluated for impairment	20,880	20,665	20,880	20,665
Allowance for loan losses: Amounts related to purchased credit impaired loans	417	574	417	574
Allowance for loan losses: Collectively evaluated for impairment	112,798	138,022	112,798	138,022
Loans: Individually evaluated for impairment	271,024	235,039	271,024	235,039
Loans: Purchased credit impaired loans	20,186	11,534	20,186	11,534
Loans: Collectively evaluated for impairment	7,838,219	6,887,355	7,838,219	6,887,355
Loans receivable	8,129,429	7,133,928	8,129,429	7,133,928	7,613,917
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance			11,083	9,858
Allowance for loan losses: Ending balance	13,559	10,783	13,559	10,783
Allowance for loan losses: Individually evaluated for impairment	477	223	477	223
Allowance for loan losses: Amounts related to purchased credit impaired loans	784	1,088	784	1,088
Allowance for loan losses: Collectively evaluated for impairment	12,298	9,472	12,298	9,472
Loans: Individually evaluated for impairment	6,351	6,458	6,351	6,458
Loans: Purchased credit impaired loans	13,021	16,417	13,021	16,417
Loans: Collectively evaluated for impairment	2,056,642	1,878,950	2,056,642	1,878,950
Loans receivable	$ 2,076,014	$ 1,901,825	2,076,014	1,901,825	$ 1,906,821
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs				(28)
Allowance for loan losses: Recoveries			115	239
Allowance for loan losses: Net provision for loan losses			(247)	(86)
Allowance for loan losses: Decrease in FDIC loss share receivable			(47)	(2)
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries			5	76
Allowance for loan losses: Net provision for loan losses			(27)	54
Allowance for loan losses: Decrease in FDIC loss share receivable			(47)	(2)
Total Commercial & Industrial [Member] | Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs				(28)
Allowance for loan losses: Recoveries			110	163
Allowance for loan losses: Net provision for loan losses			(220)	(140)
Allowance for loan losses: Decrease in FDIC loss share receivable
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(35,774)	(29,164)
Allowance for loan losses: Recoveries			6,774	2,996
Allowance for loan losses: Net provision for loan losses			18,698	76,803
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(35,247)	(27,504)
Allowance for loan losses: Recoveries			6,437	2,709
Allowance for loan losses: Net provision for loan losses			15,922	74,500
Total Commercial & Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs			(527)	(1,660)
Allowance for loan losses: Recoveries			337	287
Allowance for loan losses: Net provision for loan losses			$ 2,776	$ 2,303

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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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