Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Information
Interest income	$ 311,759	$ 296,676	$ 258,069	$ 211,294	$ 181,439	$ 134,112	$ 89,270	$ 76,012	$ 1,077,798	$ 480,833	$ 311,886
Interest expense	187,434	179,240	152,452	110,601	86,029	48,727	17,239	10,287	629,727	162,282	33,892
Net Interest Income	124,325	117,436	105,617	100,693	95,410	85,385	72,031	65,725	448,071	318,551	277,994
Provision for credit losses	6,747	4,014	22,603	6,867	6,407	2,225	6,212	2,451	40,231	17,295	5,012
Net Interest Income After Provision for Credit Losses	117,578	113,422	83,014	93,826	89,003	83,160	65,819	63,274	407,840	301,256	272,982
Noninterest income	34,454	36,068	29,882	14,264	22,982	29,186	39,171	34,597	114,668	125,936	157,333
Noninterest expense	52,579	42,930	44,320	34,772	37,109	34,951	32,957	31,033	174,601	136,050	125,385
Income Before Income Taxes	99,453	106,560	68,576	73,318	74,876	77,395	72,033	66,838	347,907	291,142	304,930
Income taxes	21,980	25,056	3,274	18,363	17,720	18,907	18,098	16,696	68,673	71,421	77,826
Net Income	77,473	$ 81,504	$ 65,302	$ 54,955	57,156	$ 58,488	$ 53,935	$ 50,142	279,234	219,721	227,104
Total assets	16,952,516				12,615,227				16,952,516	12,615,227	11,278,638
Other
Segment Information
Interest income									6,315	8,242	5,344
Interest expense									(6,763)	(3,081)	(3,114)
Net Interest Income									13,078	11,323	8,458
Net Interest Income After Provision for Credit Losses									13,078	11,323	8,458
Noninterest income									(11,100)	(9,170)	(4,426)
Noninterest expense									33,925	25,114	17,813
Income Before Income Taxes									(31,947)	(22,961)	(13,781)
Income taxes									(6,785)	(5,215)	(3,364)
Net Income									(25,162)	(17,746)	(10,417)
Total assets	258,301				156,599				258,301	156,599	75,407
Multi-family Mortgage Banking | Operating Segments
Segment Information
Interest income									5,718	2,239	957
Interest expense									52
Net Interest Income									5,666	2,239	957
Provision for credit losses										1,153
Net Interest Income After Provision for Credit Losses									5,666	1,086	957
Noninterest income									123,980	155,883	141,605
Noninterest expense									83,862	82,213	71,486
Income Before Income Taxes									45,784	74,756	71,076
Income taxes									9,311	20,114	19,572
Net Income									36,473	54,642	51,504
Total assets	411,097				351,274				411,097	351,274	296,129
Mortgage Warehousing | Operating Segments
Segment Information
Interest income									276,366	115,870	134,120
Interest expense									184,486	48,079	8,930
Net Interest Income									91,880	67,791	125,190
Provision for credit losses									2,782	37	(1,022)
Net Interest Income After Provision for Credit Losses									89,098	67,754	126,212
Noninterest income									14,315	5,400	12,399
Noninterest expense									14,003	10,420	11,949
Income Before Income Taxes									89,410	62,734	126,662
Income taxes									15,885	14,130	31,503
Net Income									73,525	48,604	95,159
Total assets	4,522,175				2,519,810				4,522,175	2,519,810	3,977,537
Banking | Operating Segments
Segment Information
Interest income									789,399	354,482	171,465
Interest expense									451,952	117,284	28,076
Net Interest Income									337,447	237,198	143,389
Provision for credit losses									37,449	16,105	6,034
Net Interest Income After Provision for Credit Losses									299,998	221,093	137,355
Noninterest income									(12,527)	(26,177)	7,755
Noninterest expense									42,811	18,303	24,137
Income Before Income Taxes									244,660	176,613	120,973
Income taxes									50,262	42,392	30,115
Net Income									194,398	134,221	90,858
Total assets	$ 11,760,943				$ 9,587,544				$ 11,760,943	$ 9,587,544	$ 6,929,565