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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	$ 5,766,234	$ 4,637,610
Securities Available for Sale, Gross Unrealized Gains	236,826	52,367
Securities Available for Sale, Gross Unrealized Losses	3,733	14,673
Securities Available for Sale, Fair Value	5,999,327	4,675,304
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	207,365	98,320
Securities Available for Sale, Gross Unrealized Gains	6,289	652
Securities Available for Sale, Gross Unrealized Losses	284	300
Securities Available for Sale, Fair Value	213,370	98,672
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	309,342	242,016
Securities Available for Sale, Gross Unrealized Gains	17,536	7,789
Securities Available for Sale, Gross Unrealized Losses	153
Securities Available for Sale, Fair Value	326,725	249,805
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	2,560,249	1,910,909
Securities Available for Sale, Gross Unrealized Gains	69,570	20,268
Securities Available for Sale, Gross Unrealized Losses	8	7,020
Securities Available for Sale, Fair Value	2,629,811	1,924,157
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	2,323,306	1,570,765
Securities Available for Sale, Gross Unrealized Gains	135,516	19,880
Securities Available for Sale, Gross Unrealized Losses	3,288	4,178
Securities Available for Sale, Fair Value	2,455,534	1,586,467
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	354,472	807,600
Securities Available for Sale, Gross Unrealized Gains	7,651	3,757
Securities Available for Sale, Gross Unrealized Losses		3,142
Securities Available for Sale, Fair Value	362,123	808,215
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	11,500	8,000
Securities Available for Sale, Gross Unrealized Gains	264	21
Securities Available for Sale, Gross Unrealized Losses		33
Securities Available for Sale, Fair Value	$ 11,764	$ 7,988

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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