Investment Securities (Schedule of Unrealized Loss on Investments, AFS) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value
Less than 12 months, fair value	$ 22,617	$ 63,970
More than 12 months, fair value	430,636	387,399
Fair value	453,253	451,369
Unrealized Loss
Less than 12 months, unrealized loss	912	4,267
More than 12 months, unrealized loss	49,472	54,085
Unrealized loss	50,384	58,352
Asset-backed securities issued by GSEs and U.S. Agencies
Fair Value
Less than 12 months, fair value	9,383	24,688
More than 12 months, fair value	273,811	259,127
Fair value	283,194	283,815
Unrealized Loss
Less than 12 months, unrealized loss	543	1,493
More than 12 months, unrealized loss	27,769	30,512
Unrealized loss	28,312	32,005
Asset-backed securities issued by Others
Fair Value
Less than 12 months, fair value	10,266	7,469
More than 12 months, fair value	129	138
Fair value	10,395	7,607
Unrealized Loss
Less than 12 months, unrealized loss	353	381
More than 12 months, unrealized loss	20	19
Unrealized loss	373	400
Student Loan Trust ABSs
Fair Value
Less than 12 months, fair value	0	1,950
More than 12 months, fair value	40,076	42,170
Fair value	40,076	44,120
Unrealized Loss
Less than 12 months, unrealized loss	0	1
More than 12 months, unrealized loss	1,866	2,292
Unrealized loss	1,866	2,293
Municipal bonds
Fair Value
Less than 12 months, fair value	1,107	6,695
More than 12 months, fair value	81,785	72,923
Fair value	82,892	79,618
Unrealized Loss
Less than 12 months, unrealized loss	10	796
More than 12 months, unrealized loss	16,784	19,352
Unrealized loss	16,794	20,148
Corporate bonds
Fair Value
Less than 12 months, fair value	1,861	4,404
More than 12 months, fair value	2,502	0
Fair value	4,363	4,404
Unrealized Loss
Less than 12 months, unrealized loss	6	459
More than 12 months, unrealized loss	498	0
Unrealized loss	504	459
U.S. government obligations
Fair Value
Less than 12 months, fair value	0	18,764
More than 12 months, fair value	32,333	13,041
Fair value	32,333	31,805
Unrealized Loss
Less than 12 months, unrealized loss	0	1,137
More than 12 months, unrealized loss	2,535	1,910
Unrealized loss	$ 2,535	$ 3,047

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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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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