Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Segment and Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	$ 194,514	$ 217,308
Allowance for loan losses: Net provision for loan losses	47,708	36,116	$ 58,968
Allowance for loan losses: Ending balance	191,251	194,514	217,308
Reserve for unfunded lending commitments: Provision for losses	3,974
Reserve for unfunded lending commitments: Ending balance	3,974
Total allowance for credit losses	195,225
Allowance for loan losses: Individually evaluated for impairment	22,385	5,114
Allowance for loan losses: Amounts related to purchased credit impaired loans	8,257	10,734
Allowance for loan losses: Collectively evaluated for impairment	160,609	178,666
Reserve for unfunded lending commitments: Individually evaluated for impairment	3,974
Loans: Individually evaluated for impairment	245,651	268,755
Loans: Purchased credit impaired loans	215,245	129,596
Loans: Collectively evaluated for impairment	20,751,859	19,628,060
Loans receivable	21,212,755	20,026,411
Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(59,077)	(74,622)
Allowance for loan losses: Recoveries	12,080	22,360
Allowance for loan losses: Net provision for loan losses	43,734	36,116
Allowance for loan losses: Others		(6,648)
Total Commercial [Member] \| Commercial Real Estate - Income Producing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	17,638	13,709
Allowance for loan losses: Ending balance	20,869	17,638	13,709
Total allowance for credit losses	20,869
Allowance for loan losses: Individually evaluated for impairment	18	210
Allowance for loan losses: Amounts related to purchased credit impaired loans	39	43
Allowance for loan losses: Collectively evaluated for impairment	20,812	17,385
Loans: Individually evaluated for impairment	1,898	2,701
Loans: Purchased credit impaired loans	35,353	3,757
Loans: Collectively evaluated for impairment	2,957,197	2,335,321
Loans receivable	2,994,448	2,341,779
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	(32)	(1,633)
Allowance for loan losses: Recoveries	569	221
Allowance for loan losses: Net provision for loan losses	2,694	5,341
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	15,647	7,372
Allowance for loan losses: Ending balance	9,350	15,647	7,372
Total allowance for credit losses	9,350
Allowance for loan losses: Individually evaluated for impairment	21	1
Allowance for loan losses: Amounts related to purchased credit impaired loans	136	83
Allowance for loan losses: Collectively evaluated for impairment	9,193	15,563
Loans: Individually evaluated for impairment	277	121
Loans: Purchased credit impaired loans	20,516	3,387
Loans: Collectively evaluated for impairment	1,136,658	1,544,827
Loans receivable	1,157,451	1,548,335
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	(7)	(334)
Allowance for loan losses: Recoveries	140	96
Allowance for loan losses: Net provision for loan losses	(6,430)	8,513
Total Commercial [Member] \| Total Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	111,509	140,880
Allowance for loan losses: Ending balance	117,409	111,509	140,880
Reserve for unfunded lending commitments: Provision for losses	3,974
Reserve for unfunded lending commitments: Ending balance	3,974
Total allowance for credit losses	121,383
Allowance for loan losses: Individually evaluated for impairment	21,837	4,243
Allowance for loan losses: Amounts related to purchased credit impaired loans	333	454
Allowance for loan losses: Collectively evaluated for impairment	95,239	106,812
Reserve for unfunded lending commitments: Individually evaluated for impairment	3,974
Loans: Individually evaluated for impairment	236,819	261,050
Loans: Purchased credit impaired loans	67,273	12,841
Loans: Collectively evaluated for impairment	11,601,315	10,804,458
Loans receivable	11,905,407	11,078,349
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: Charge-offs	(39,737)	(48,128)
Allowance for loan losses: Recoveries	7,246	14,702
Allowance for loan losses: Net provision for loan losses	38,391	4,055
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	97,752	127,918
Allowance for loan losses: Ending balance	106,432	97,752	127,918
Reserve for unfunded lending commitments: Provision for losses	3,974
Reserve for unfunded lending commitments: Ending balance	3,974
Total allowance for credit losses	110,406
Allowance for loan losses: Individually evaluated for impairment	21,733	3,636
Allowance for loan losses: Amounts related to purchased credit impaired loans	164	239
Allowance for loan losses: Collectively evaluated for impairment	84,535	93,877
Reserve for unfunded lending commitments: Individually evaluated for impairment	3,974
Loans: Individually evaluated for impairment	232,438	239,384
Loans: Purchased credit impaired loans	31,073	6,629
Loans: Collectively evaluated for impairment	8,903,436	8,374,588
Loans receivable	9,166,947	8,620,601
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Non-Real Estate [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(39,600)	(40,069)
Allowance for loan losses: Recoveries	6,940	14,385
Allowance for loan losses: Net provision for loan losses	41,340	(4,482)
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	13,757	12,962
Allowance for loan losses: Ending balance	10,977	13,757	12,962
Total allowance for credit losses	10,977
Allowance for loan losses: Individually evaluated for impairment	104	607
Allowance for loan losses: Amounts related to purchased credit impaired loans	169	215
Allowance for loan losses: Collectively evaluated for impairment	10,704	12,935
Loans: Individually evaluated for impairment	4,381	21,666
Loans: Purchased credit impaired loans	36,200	6,212
Loans: Collectively evaluated for impairment	2,697,879	2,429,870
Loans receivable	2,738,460	2,457,748
Total Commercial [Member] \| Total Commercial And Industrial [Member] \| Commercial Real Estate - Owner Occupied [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(137)	(8,059)
Allowance for loan losses: Recoveries	306	317
Allowance for loan losses: Net provision for loan losses	(2,949)	8,537
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	23,782	24,844
Allowance for loan losses: Ending balance	20,331	23,782	24,844
Total allowance for credit losses	20,331
Allowance for loan losses: Individually evaluated for impairment	217	444
Allowance for loan losses: Amounts related to purchased credit impaired loans	7,474	9,766
Allowance for loan losses: Collectively evaluated for impairment	12,640	13,572
Loans: Individually evaluated for impairment	5,174	3,876
Loans: Purchased credit impaired loans	86,757	105,430
Loans: Collectively evaluated for impairment	2,898,700	2,800,775
Loans receivable	2,990,631	2,910,081
Residential Mortgages [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(846)	(614)
Allowance for loan losses: Recoveries	480	2,179
Allowance for loan losses: Net provision for loan losses	(3,085)	(2,627)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Beginning balance	25,938	30,503
Allowance for loan losses: Ending balance	23,292	25,938	$ 30,503
Total allowance for credit losses	23,292
Allowance for loan losses: Individually evaluated for impairment	292	216
Allowance for loan losses: Amounts related to purchased credit impaired loans	275	388
Allowance for loan losses: Collectively evaluated for impairment	22,725	25,334
Loans: Individually evaluated for impairment	1,483	1,007
Loans: Purchased credit impaired loans	5,346	4,181
Loans: Collectively evaluated for impairment	2,157,989	2,142,679
Loans receivable	2,164,818	2,147,867
Consumer [Member] \| Non-Purchased Credit Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Charge-offs	(18,455)	(23,913)
Allowance for loan losses: Recoveries	3,645	5,162
Allowance for loan losses: Net provision for loan losses	$ 12,164	20,834
Allowance for loan losses: Others		$ (6,648)

Provision for losses on unfunded commitments.

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Reserve for unfunded lending commitments.

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Reserve for unfunded lending commitments individually evaluated for Impairment.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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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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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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The balance of financing receivables that were collectively 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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