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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	$ 6,151,183	$ 6,310,214
Securities Available for Sale, Gross unrealized gains	1,954	2,315
Securities Available for Sale, Gross unrealized losses	738,448	756,488
Securities Available for Sale, Fair value	5,414,689	5,556,041
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	113,195	113,211
Securities Available for Sale, Gross unrealized losses	3,343	2,346
Securities Available for Sale, Fair value	109,852	110,865
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	205,306	207,014
Securities Available for Sale, Gross unrealized gains	40	59
Securities Available for Sale, Gross unrealized losses	4,841	3,981
Securities Available for Sale, Fair value	200,505	203,092
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	2,507,541	2,655,381
Securities Available for Sale, Gross unrealized gains	141	224
Securities Available for Sale, Gross unrealized losses	381,119	398,619
Securities Available for Sale, Fair value	2,126,563	2,256,986
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	3,232,868	3,234,278
Securities Available for Sale, Gross unrealized gains	1,773	2,032
Securities Available for Sale, Gross unrealized losses	339,425	342,880
Securities Available for Sale, Fair value	2,895,216	2,893,430
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	68,773	76,830
Securities Available for Sale, Gross unrealized gains
Securities Available for Sale, Gross unrealized losses	6,043	6,242
Securities Available for Sale, Fair value	62,730	70,588
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities available for sale, amortized cost	23,500	23,500
Securities Available for Sale, Gross unrealized gains
Securities Available for Sale, Gross unrealized losses	3,677	2,420
Securities Available for Sale, Fair value	$ 19,823	$ 21,080

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).

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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).

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