Investment Securities - HTM (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
HTM Securities
Amortized Cost Basis	$ 642,979	$ 676,652
Credit Loss Allowance	(10,240)	(3,182)
Net Carrying Amount	632,739	673,470
Gross Unrealized Holding Gains	257	202
Gross Unrealized Holding Losses	(35,636)	(36,397)
Fair Value	597,360	637,275
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at December 31, 2022	3,182
Credit loss (reversal) provision, net	7,058
Credit loss allowance at March 31, 2023	10,240
HTM preferred equity interests
Less than one year	369,992
One to three years	190,459
Three to five years	63,174
Thereafter	9,114
Total	632,739
CMBS
HTM Securities
Amortized Cost Basis	581,525	577,681
Credit Loss Allowance	(154)	(172)
Net Carrying Amount	581,371	577,509
Gross Unrealized Holding Gains	95	30
Gross Unrealized Holding Losses	(30,190)	(30,424)
Fair Value	551,276	547,115
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at December 31, 2022	172
Credit loss (reversal) provision, net	(18)
Credit loss allowance at March 31, 2023	154
HTM preferred equity interests
Less than one year	339,465
One to three years	190,459
Three to five years	51,447
Thereafter	0
Total	581,371
Preferred interests
HTM Securities
Amortized Cost Basis	30,527	29,757
Credit Loss Allowance	0	0
Net Carrying Amount	30,527	29,757
Gross Unrealized Holding Gains	125	125
Gross Unrealized Holding Losses	(5,424)	(4,863)
Fair Value	25,228	25,019
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at December 31, 2022	0
Credit loss allowance at March 31, 2023	0
HTM preferred equity interests
Less than one year	30,527
One to three years	0
Three to five years	0
Thereafter	0
Total	30,527
Infrastructure bonds
HTM Securities
Amortized Cost Basis	30,927	69,214
Credit Loss Allowance	(10,086)	(3,010)
Net Carrying Amount	20,841	66,204
Gross Unrealized Holding Gains	37	47
Gross Unrealized Holding Losses	(22)	(1,110)
Fair Value	20,856	$ 65,141
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at December 31, 2022	3,010
Credit loss (reversal) provision, net	7,076
Credit loss allowance at March 31, 2023	10,086
HTM preferred equity interests
Less than one year	0
One to three years	0
Three to five years	11,727
Thereafter	9,114
Total	$ 20,841