INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details) $ in Thousands	Sep. 30, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Number of Securities
Less Than 12 Months | security	27	142
12 Months or More | security	90	88
Total | security	117	230
Fair Value
Less Than 12 Months	$ 117,450	$ 278,098
12 Months or More	378,195	380,299
Total	495,645	658,397
Unrealized Losses
Less Than 12 Months	1,163	2,233
12 Months or More	29,007	34,742
Total	$ 30,170	$ 36,975
U.S. Treasury securities
Number of Securities
Less Than 12 Months | security	0	0
12 Months or More | security	3	3
Total | security	3	3
Fair Value
Less Than 12 Months	$ 0	$ 0
12 Months or More	18,803	18,063
Total	18,803	18,063
Unrealized Losses
Less Than 12 Months	0	0
12 Months or More	1,230	1,980
Total	$ 1,230	$ 1,980
States and political subdivisions
Number of Securities
Less Than 12 Months | security	3	13
12 Months or More | security	42	42
Total | security	45	55
Fair Value
Less Than 12 Months	$ 10,586	$ 10,080
12 Months or More	178,052	189,448
Total	188,638	199,528
Unrealized Losses
Less Than 12 Months	351	131
12 Months or More	19,110	20,269
Total	$ 19,461	$ 20,400
GSE residential MBSs
Number of Securities
Less Than 12 Months | security	0	68
12 Months or More | security	8	15
Total | security	8	83
Fair Value
Less Than 12 Months	$ 0	$ 85,836
12 Months or More	13,223	55,579
Total	13,223	141,415
Unrealized Losses
Less Than 12 Months	0	1,117
12 Months or More	2,216	3,180
Total	$ 2,216	$ 4,297
GSE commercial MBSs
Number of Securities
Less Than 12 Months | security	2	3
12 Months or More | security	0	0
Total | security	2	3
Fair Value
Less Than 12 Months	$ 1,263	$ 2,963
12 Months or More	0	0
Total	1,263	2,963
Unrealized Losses
Less Than 12 Months	17	21
12 Months or More	0	0
Total	$ 17	$ 21
GSE residential CMOs
Number of Securities
Less Than 12 Months | security	16	52
12 Months or More | security	24	15
Total | security	40	67
Fair Value
Less Than 12 Months	$ 84,689	$ 158,439
12 Months or More	108,285	56,443
Total	192,974	214,882
Unrealized Losses
Less Than 12 Months	616	729
12 Months or More	4,537	6,080
Total	$ 5,153	$ 6,809
Non-agency CMOs
Number of Securities
Less Than 12 Months | security	2	2
12 Months or More | security	5	4
Total | security	7	6
Fair Value
Less Than 12 Months	$ 7,133	$ 8,816
12 Months or More	22,344	16,636
Total	29,477	25,452
Unrealized Losses
Less Than 12 Months	58	218
12 Months or More	1,078	2,248
Total	$ 1,136	$ 2,466
Asset-backed
Number of Securities
Less Than 12 Months | security	4	4
12 Months or More | security	8	9
Total | security	12	13
Fair Value
Less Than 12 Months	$ 13,779	$ 11,964
12 Months or More	37,488	44,130
Total	51,267	56,094
Unrealized Losses
Less Than 12 Months	121	17
12 Months or More	836	985
Total	$ 957	$ 1,002