Loans and Leases (Details 8) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 132,472
Charge-offs	(3,465)
Recoveries	3,274
Allowance for Loan and Lease Losses, Net charge-offs	(191)
Provision	4,000
Balance, end of period	136,281
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment	6,201
Collectively evaluated for impairment	130,080
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment	101,000
Collectively evaluated for impairment	18,206,697
Ending balance of loans and leases	18,307,697		$ 17,957,713
Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		$ 139,456
Charge-offs		(12,153)
Recoveries		7,198
Allowance for Loan and Lease Losses, Net charge-offs		(4,955)
Provision		(226)
Balance, end of period		134,275
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment		14,245
Collectively evaluated for impairment		120,030
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment		162,818
Collectively evaluated for impairment		16,292,467
Ending balance of loans and leases		16,455,285	17,957,713	[1]
Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		6,444
Real Estate Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	46,021
Charge-offs	(196)
Recoveries	143
Allowance for Loan and Lease Losses, Net charge-offs	(53)	(941)
Provision	(214)
Balance, end of period	45,754
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment	270
Collectively evaluated for impairment	45,484
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment	23,908
Collectively evaluated for impairment	8,135,550
Ending balance of loans and leases	8,159,458		7,918,141
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		40,051
Charge-offs		(2,598)
Recoveries		1,657
Provision		1,048
Balance, end of period		40,158
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment		1,088
Collectively evaluated for impairment		39,070
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment		74,390
Collectively evaluated for impairment		7,479,853
Ending balance of loans and leases		7,554,243	7,918,141
Real Estate Construction and Land
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	28,209
Charge-offs	0
Recoveries	0
Allowance for Loan and Lease Losses, Net charge-offs	0	9
Provision	(1,001)
Balance, end of period	27,208
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment	0
Collectively evaluated for impairment	27,208
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment	5,432
Collectively evaluated for impairment	2,346,292
Ending balance of loans and leases	2,351,724		2,233,656
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		13,055
Charge-offs		0
Recoveries		9
Provision		5,126
Balance, end of period		18,190
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment		0
Collectively evaluated for impairment		18,190
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment		5,670
Collectively evaluated for impairment		1,671,332
Ending balance of loans and leases		1,677,002	2,233,656
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	56,360
Charge-offs	(3,003)
Recoveries	3,106
Allowance for Loan and Lease Losses, Net charge-offs	103	(4,037)
Provision	5,033
Balance, end of period	61,496
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment	5,931
Collectively evaluated for impairment	55,565
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment	71,660
Collectively evaluated for impairment	7,352,694
Ending balance of loans and leases	7,424,354		7,404,595
Commercial | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		84,022
Charge-offs		(9,524)
Recoveries		5,487
Provision		(6,205)
Balance, end of period		73,780
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment		13,141
Collectively evaluated for impairment		60,639
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment		82,434
Collectively evaluated for impairment		6,743,689
Ending balance of loans and leases		6,826,123	7,404,595
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,882
Charge-offs	(266)
Recoveries	25
Allowance for Loan and Lease Losses, Net charge-offs	(241)	14
Provision	182
Balance, end of period	1,823
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment	0
Collectively evaluated for impairment	1,823
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment	0
Collectively evaluated for impairment	372,161
Ending balance of loans and leases	$ 372,161		401,321
Consumer | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		2,328
Charge-offs		(31)
Recoveries		45
Provision		(195)
Balance, end of period		2,147
Amount of the allowance applicable to loans and leases:
Individually evaluated for impairment		16
Collectively evaluated for impairment		2,131
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated for impairment		324
Collectively evaluated for impairment		397,593
Ending balance of loans and leases		397,917	$ 401,321
Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses, Net charge-offs		$ (4,955)

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmQzMzExZmVkOTBhODQ1NjA5NDk2ZjFhMTBlY2ExZGJjfFRleHRTZWxlY3Rpb246NzA2MUJGQzU1REJGNUU5M0JDNkEyQzdDNjc2NkFDREQM}