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Investment Securities - Trust Preferred Securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) issuer	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Total	$ 6,964,566	$ 5,784,754
Fair Value	7,027,950	$ 5,970,115
Pooled Trust Preferred Securities
Debt Securities, Available-for-sale [Line Items]
Total	13,751
Fair Value	9,367
Unrealized Gain/ (Loss)	$ (4,384)
Pooled Trust Preferred Securities | Pretsl XXVII LTD
Debt Securities, Available-for-sale [Line Items]
Pooled trust preferred securities, Class	B
Lowest Credit Rating	BB
Total	$ 4,197
Fair Value	2,920
Unrealized Gain/ (Loss)	$ (1,277)
Number of Issuers Currently Performing | issuer	31
Number of Issuers Currently Remaining | issuer	40
Actual Deferrals and Defaults as a % of Original Collateral	12.30%
Expected Defaults as a % of Remaining Performing Collateral	13.50%
Excess Subordination as a % of Current Performing Collateral	40.80%
Pooled Trust Preferred Securities | Trapeza Ser 13A
Debt Securities, Available-for-sale [Line Items]
Pooled trust preferred securities, Class	A2A
Lowest Credit Rating	A
Total	$ 9,554
Fair Value	6,447
Unrealized Gain/ (Loss)	$ (3,107)
Number of Issuers Currently Performing | issuer	38
Number of Issuers Currently Remaining | issuer	40
Actual Deferrals and Defaults as a % of Original Collateral	4.50%
Expected Defaults as a % of Remaining Performing Collateral	6.20%
Excess Subordination as a % of Current Performing Collateral	61.20%
Single Issuer Trust Preferred Securities | JP Morgan Chase & Co
Debt Securities, Available-for-sale [Line Items]
Lowest Credit Rating	BBB-
Total	$ 4,819
Fair Value	4,633
Unrealized Gain/ (Loss)	(186)
Trust Preferred Securities
Debt Securities, Available-for-sale [Line Items]
Total	18,570
Fair Value	14,000
Unrealized Gain/ (Loss)	$ (4,570)

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The lowest credit rating for the security provided by any nationally recognized credit rating agency for the trust preferred securities.

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The class categorization on the pooled trust preferred securities.

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The excess subordination on pooled trust preferred securities as a percentage of current performing collateral.

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The expected defaults on pooled trust preferred securities as a percentage of remaining performing collateral.

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The number of issuers of the pooled trust preferred securities that are currently performing.

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The number of issuers of the pooled trust preferred securities that are currently remaining.

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Amortized cost excluding accrued interest, before allowance for credit loss, 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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Amount excluding accrued interest, 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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