Investment Securities - HTM Debt Securities, Amortized Cost​ (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
HTM Securities
Allowance for credit loss	$ 393,909	$ 431,424
Credit Loss Allowance	(23,490)	(24,463)
Net Carrying Amount	370,419	406,961
Gross Unrealized Holding Gains	20	336
Gross Unrealized Holding Losses	(25,053)	(24,903)
Fair Value	345,386	382,394
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at beginning	24,463
Credit loss reversal	(973)
Credit loss allowance at ending	23,490
HTM preferred equity interests
Less than one year	285,526
One to three years	62,462
Three to five years	13,318
Thereafter	9,113
Total	370,419
CMBS
HTM Securities
Allowance for credit loss	309,817	357,012
Credit Loss Allowance	(11)	(85)
Net Carrying Amount	309,806	356,927
Gross Unrealized Holding Gains	0	315
Gross Unrealized Holding Losses	(17,360)	(21,326)
Fair Value	292,446	335,916
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at beginning	85
Credit loss reversal	(74)
Credit loss allowance at ending	11
HTM preferred equity interests
Less than one year	268,353
One to three years	41,453
Three to five years	0
Thereafter	0
Total	309,806
Preferred interests
HTM Securities
Allowance for credit loss	56,865	47,069
Credit Loss Allowance	(13,409)	(14,308)
Net Carrying Amount	43,456	32,761
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	(7,685)	(3,568)
Fair Value	35,771	29,193
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at beginning	14,308
Credit loss reversal	(899)
Credit loss allowance at ending	13,409
HTM preferred equity interests
Less than one year	17,173
One to three years	12,965
Three to five years	13,318
Thereafter	0
Total	43,456
Infrastructure bonds
HTM Securities
Allowance for credit loss	27,227	27,343
Credit Loss Allowance	(10,070)	(10,070)
Net Carrying Amount	17,157	17,273
Gross Unrealized Holding Gains	20	21
Gross Unrealized Holding Losses	(8)	(9)
Fair Value	17,169	$ 17,285
Activity in credit loss allowance for HTM debt securities
Credit loss allowance at beginning	10,070
Credit loss reversal	0
Credit loss allowance at ending	10,070
HTM preferred equity interests
Less than one year	0
One to three years	8,044
Three to five years	0
Thereafter	9,113
Total	$ 17,157