Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	$ 6,238,835	$ 6,310,214
Securities Available for Sale, Gross Unrealized Gains	3,673	2,315
Securities Available for Sale, Gross Unrealized Losses	676,888	756,488
Securities Available for Sale, Fair Value	5,565,620	5,556,041
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	113,016	113,211
Securities Available for Sale, Gross Unrealized Gains	287
Securities Available for Sale, Gross Unrealized Losses	1,788	2,346
Securities Available for Sale, Fair Value	111,515	110,865
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	206,219	207,014
Securities Available for Sale, Gross Unrealized Gains	247	59
Securities Available for Sale, Gross Unrealized Losses	1,997	3,981
Securities Available for Sale, Fair Value	204,469	203,092
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	2,583,935	2,655,381
Securities Available for Sale, Gross Unrealized Gains	240	224
Securities Available for Sale, Gross Unrealized Losses	364,911	398,619
Securities Available for Sale, Fair Value	2,219,264	2,256,986
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	3,239,281	3,234,278
Securities Available for Sale, Gross Unrealized Gains	2,899	2,032
Securities Available for Sale, Gross Unrealized Losses	299,575	342,880
Securities Available for Sale, Fair Value	2,942,605	2,893,430
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	72,884	76,830
Securities Available for Sale, Gross Unrealized Losses	5,241	6,242
Securities Available for Sale, Fair Value	67,643	70,588
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	23,500	23,500
Securities Available for Sale, Gross Unrealized Losses	3,376	2,420
Securities Available for Sale, Fair Value	$ 20,124	$ 21,080

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).

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-Topic 320
-SubTopic 10
-Section 50
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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of 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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