Loans and Leases Held for Investment at Amortized Cost, Net of Allowance For Loan and Lease Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Term Loans and Leases by Origination Year
Total	$ 4,850,302	$ 5,033,154
Loans And Leases Held For Investment At Amortized Cost
Term Loans and Leases by Origination Year
Portfolio layer method basis adjustment - increase (decrease)	8,881
Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method
Term Loans and Leases by Origination Year
Year one	1,648,591	3,064,021
Year two	1,885,009	1,102,517
Year three	535,309	31,465
Year four	29,960	24,226
Year five	22,708	4,546
Prior	29,461	33,833
Total	4,151,038	4,260,608
Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Unsecured personal
Term Loans and Leases by Origination Year
Year one	1,522,462	2,861,207
Year two	1,737,631	1,005,166
Year three	457,856	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	3,717,949	3,866,373
Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Residential mortgages
Term Loans and Leases by Origination Year
Year one	53	49,721
Year two	48,473	58,353
Year three	54,855	31,465
Year four	29,960	21,683
Year five	20,248	4,546
Prior	29,461	33,833
Total	183,050	199,601
Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Secured consumer
Term Loans and Leases by Origination Year
Year one	126,076	153,093
Year two	98,905	38,998
Year three	22,598	0
Year four	0	2,543
Year five	2,460	0
Prior	0	0
Total	250,039	194,634
Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Year one	92,648	220,905
Year two	220,696	202,382
Year three	118,301	111,040
Year four	68,608	91,253
Year five	74,370	57,687
Prior	115,760	89,279
Total	690,383	772,546
Commercial Portfolio Segment | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	167,982	189,756
Commercial Portfolio Segment | Equipment finance
Term Loans and Leases by Origination Year
Year one	2,945	59,227
Year two	48,665	40,312
Year three	28,273	25,873
Year four	14,075	19,544
Year five	10,746	11,919
Prior	6,288	3,444
Total	110,992	160,319
Commercial Portfolio Segment | Equipment finance | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Equipment finance | Pass
Term Loans and Leases by Origination Year
Year one	2,945	59,227
Year two	33,430	38,218
Year three	26,311	25,014
Year four	7,754	15,785
Year five	9,411	11,880
Prior	6,288	3,444
Total	86,139	153,568
Commercial Portfolio Segment | Equipment finance | Pass | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Equipment finance | Special mention
Term Loans and Leases by Origination Year
Year one	0	0
Year two	15,235	2,094
Year three	1,962	0
Year four	5,873	3,759
Year five	1,335	0
Prior	0	0
Total	24,405	5,853
Commercial Portfolio Segment | Equipment finance | Special mention | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Equipment finance | Substandard
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	859
Year four	448	0
Year five	0	39
Prior	0	0
Total	448	898
Commercial Portfolio Segment | Equipment finance | Substandard | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Equipment finance | Doubtful
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	0	0
Commercial Portfolio Segment | Equipment finance | Doubtful | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Equipment finance | Loss
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	0	0
Commercial Portfolio Segment | Equipment finance | Loss | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Commercial real estate
Term Loans and Leases by Origination Year
Year one	49,067	100,602
Year two	97,845	53,445
Year three	43,766	55,912
Year four	43,058	53,737
Year five	52,160	39,633
Prior	94,426	70,172
Total	380,322	373,501
Commercial Portfolio Segment | Commercial real estate | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	44,319	40,693
Commercial Portfolio Segment | Commercial real estate | Pass
Term Loans and Leases by Origination Year
Year one	49,067	100,602
Year two	94,247	53,445
Year three	34,535	47,497
Year four	43,058	52,834
Year five	52,160	35,992
Prior	78,062	60,976
Total	351,129	351,346
Commercial Portfolio Segment | Commercial real estate | Pass | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	33,423	40,693
Commercial Portfolio Segment | Commercial real estate | Special mention
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	8,415
Year four	0	260
Year five	0	1,237
Prior	13,706	405
Total	13,706	10,317
Commercial Portfolio Segment | Commercial real estate | Special mention | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Commercial real estate | Substandard
Term Loans and Leases by Origination Year
Year one	0	0
Year two	3,598	0
Year three	7,716	0
Year four	0	643
Year five	0	2,404
Prior	2,139	8,215
Total	13,453	11,262
Commercial Portfolio Segment | Commercial real estate | Substandard | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	9,425	0
Commercial Portfolio Segment | Commercial real estate | Doubtful
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	0	0
Commercial Portfolio Segment | Commercial real estate | Doubtful | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	0	0
Commercial Portfolio Segment | Commercial real estate | Loss
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	1,515	0
Year four	0	0
Year five	0	0
Prior	519	576
Total	2,034	576
Commercial Portfolio Segment | Commercial real estate | Loss | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	1,471	0
Commercial Portfolio Segment | Commercial and industrial
Term Loans and Leases by Origination Year
Year one	40,636	61,076
Year two	74,186	108,625
Year three	46,262	29,255
Year four	11,475	17,972
Year five	11,464	6,135
Prior	15,046	15,663
Total	199,069	238,726
Commercial Portfolio Segment | Commercial and industrial | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	123,663	149,063
Commercial Portfolio Segment | Commercial and industrial | Pass
Term Loans and Leases by Origination Year
Year one	40,636	61,076
Year two	60,352	99,264
Year three	39,304	24,726
Year four	9,525	13,866
Year five	10,282	5,174
Prior	11,626	10,831
Total	171,725	214,937
Commercial Portfolio Segment | Commercial and industrial | Pass | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	104,928	141,858
Commercial Portfolio Segment | Commercial and industrial | Special mention
Term Loans and Leases by Origination Year
Year one	0	0
Year two	10,881	0
Year three	1,532	0
Year four	729	483
Year five	137	163
Prior	444	455
Total	13,723	1,101
Commercial Portfolio Segment | Commercial and industrial | Special mention | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	9,384	44
Commercial Portfolio Segment | Commercial and industrial | Substandard
Term Loans and Leases by Origination Year
Year one	0	0
Year two	2,304	9,361
Year three	5,426	4,529
Year four	673	3,623
Year five	1,045	797
Prior	1,434	2,820
Total	10,882	21,130
Commercial Portfolio Segment | Commercial and industrial | Substandard | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	6,908	5,716
Commercial Portfolio Segment | Commercial and industrial | Doubtful
Term Loans and Leases by Origination Year
Year one	0	0
Year two	649	0
Year three	0	0
Year four	548	0
Year five	0	0
Prior	286	286
Total	1,483	286
Commercial Portfolio Segment | Commercial and industrial | Doubtful | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	1,214	216
Commercial Portfolio Segment | Commercial and industrial | Loss
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	1
Prior	1,256	1,271
Total	1,256	1,272
Commercial Portfolio Segment | Commercial and industrial | Loss | Loans guaranteed by the Small Business Association
Term Loans and Leases by Origination Year
Total	1,229	1,229
Current | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Unsecured personal
Term Loans and Leases by Origination Year
Year one	1,498,737	2,835,460
Year two	1,688,512	977,224
Year three	438,296	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	3,625,545	3,812,684
Current | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Residential mortgages
Term Loans and Leases by Origination Year
Year one	53	49,721
Year two	48,473	58,353
Year three	54,855	31,465
Year four	29,960	21,683
Year five	18,917	4,546
Prior	29,041	33,248
Total	181,299	199,016
Current | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Secured consumer
Term Loans and Leases by Origination Year
Year one	125,618	151,725
Year two	97,084	38,076
Year three	21,949	0
Year four	0	2,543
Year five	2,460	0
Prior	0	0
Total	247,111	192,344
30-59 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Unsecured personal
Term Loans and Leases by Origination Year
Year one	9,034	11,149
Year two	17,017	9,867
Year three	6,665	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	32,716	21,016
30-59 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Residential mortgages
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	1,331	0
Prior	420	0
Total	1,751	0
30-59 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Secured consumer
Term Loans and Leases by Origination Year
Year one	364	1,017
Year two	1,295	703
Year three	417	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	2,076	1,720
30-59 days past due | Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Total	13,526	3,172
30-59 days past due | Commercial Portfolio Segment | Equipment finance
Term Loans and Leases by Origination Year
Total	1,265	3,172
30-59 days past due | Commercial Portfolio Segment | Commercial real estate
Term Loans and Leases by Origination Year
Total	0	0
30-59 days past due | Commercial Portfolio Segment | Commercial and industrial
Term Loans and Leases by Origination Year
Total	12,261	0
60-89 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Unsecured personal
Term Loans and Leases by Origination Year
Year one	7,767	7,785
Year two	15,538	8,633
Year three	6,251	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	29,556	16,418
60-89 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Residential mortgages
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	254
Total	0	254
60-89 days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Secured consumer
Term Loans and Leases by Origination Year
Year one	94	235
Year two	373	147
Year three	168	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	635	382
60-89 days past due | Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Total	5,198	102
60-89 days past due | Commercial Portfolio Segment | Equipment finance
Term Loans and Leases by Origination Year
Total	0	0
60-89 days past due | Commercial Portfolio Segment | Commercial real estate
Term Loans and Leases by Origination Year
Total	3,566	102
60-89 days past due | Commercial Portfolio Segment | Commercial and industrial
Term Loans and Leases by Origination Year
Total	1,632	0
90 or more days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Unsecured personal
Term Loans and Leases by Origination Year
Year one	6,924	6,813
Year two	16,564	9,442
Year three	6,644	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	30,132	16,255
90 or more days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Residential mortgages
Term Loans and Leases by Origination Year
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	331
Total	0	331
90 or more days past due | Consumer Portfolio Segment, Excluding Cumulative Basis Adjustment for Portfolio Layer Method | Secured consumer
Term Loans and Leases by Origination Year
Year one	0	116
Year two	153	72
Year three	64	0
Year four	0	0
Year five	0	0
Prior	0	0
Total	217	188
90 or more days past due | Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Total	3,133	2,502
90 or more days past due | Commercial Portfolio Segment | Equipment finance
Term Loans and Leases by Origination Year
Total	0	859
90 or more days past due | Commercial Portfolio Segment | Commercial real estate
Term Loans and Leases by Origination Year
Total	1,618	0
90 or more days past due | Commercial Portfolio Segment | Commercial and industrial
Term Loans and Leases by Origination Year
Total	1,515	1,643
Total Days Past Due | Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Total	21,857	5,776
Total Days Past Due | Commercial Portfolio Segment | Equipment finance
Term Loans and Leases by Origination Year
Total	1,265	4,031
Total Days Past Due | Commercial Portfolio Segment | Commercial real estate
Term Loans and Leases by Origination Year
Total	5,184	102
Total Days Past Due | Commercial Portfolio Segment | Commercial and industrial
Term Loans and Leases by Origination Year
Total	$ 15,408	$ 1,643