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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 2,910	$ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses	46	4,928
Available for sale, Losses 12 months or longer, Fair Value	1,723,677	1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	35,342	67,340
Available for sale, Total, Fair Value	1,726,587	2,130,477
Available for sale, Total, Gross Unrealized Losses	35,388	72,268
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses 12 months or longer, Fair Value	72,143	71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,283	2,633
Available for sale, Total, Fair Value	72,143	71,706
Available for sale, Total, Gross Unrealized Losses	1,283	2,633
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	2,270	41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses	40	591
Available for sale, Losses 12 months or longer, Fair Value	106,042	170,883
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,560	6,054
Available for sale, Total, Fair Value	108,312	212,086
Available for sale, Total, Gross Unrealized Losses	1,600	6,645
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	640	305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses	6	2,485
Available for sale, Losses 12 months or longer, Fair Value	852,716	762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	15,807	27,309
Available for sale, Total, Fair Value	853,356	1,067,916
Available for sale, Total, Gross Unrealized Losses	15,813	29,794
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		96,226
Available for sale, Losses less than 12 months, Gross Unrealized Losses		1,851
Available for sale, Losses 12 months or longer, Fair Value	583,978	570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	15,207	29,085
Available for sale, Total, Fair Value	583,978	666,711
Available for sale, Total, Gross Unrealized Losses	15,207	30,936
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		254
Available for sale, Losses less than 12 months, Gross Unrealized Losses		1
Available for sale, Losses 12 months or longer, Fair Value	108,798	111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,485	2,259
Available for sale, Total, Fair Value	108,798	112,058
Available for sale, Total, Gross Unrealized Losses	$ 1,485	$ 2,260

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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