Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands	Mar. 31, 2026 USD ($) security	Dec. 31, 2025 USD ($) security
Available for Sale:
Number of positions, Less than 12 Months | security	105	54
Fair Value, Less than 12 Months	$ 848,160	$ 482,669
Unrealized Losses, Less than 12 Months	$ (5,252)	$ (3,204)
Number of positions, 12 Months or More | security	124	115
Fair value, 12 Months or More	$ 672,154	$ 568,544
Unrealized Losses, 12 Months or More	$ (100,852)	$ (93,355)
Number of positions | security	229	169
Fair Value	$ 1,520,314	$ 1,051,213
Unrealized Losses	$ (106,104)	$ (96,559)
Held to Maturity:
Number of positions, Less than 12 Months | security	11	0
Fair Value, Less than 12 Months	$ 61,411	$ 0
Unrealized Losses, Less than 12 Months	$ (2,024)	$ 0
Number of positions, 12 Months or More | security	217	228
Fair value, 12 Months or More	$ 865,399	$ 959,977
Unrealized Losses, 12 Months or More	$ (75,832)	$ (68,264)
Number of positions | security	228	228
Fair Value	$ 926,810	$ 959,977
Unrealized Losses	$ (77,856)	$ (68,264)
Obligations of states and political subdivisions
Available for Sale:
Number of positions, Less than 12 Months | security	41	13
Fair Value, Less than 12 Months	$ 61,680	$ 19,454
Unrealized Losses, Less than 12 Months	$ (1,575)	$ (445)
Number of positions, 12 Months or More | security	11	7
Fair value, 12 Months or More	$ 15,793	$ 13,591
Unrealized Losses, 12 Months or More	$ (2,005)	$ (1,335)
Number of positions | security	52	20
Fair Value	$ 77,473	$ 33,045
Unrealized Losses	$ (3,580)	$ (1,780)
Held to Maturity:
Number of positions, Less than 12 Months | security	7	0
Fair Value, Less than 12 Months	$ 17,311	$ 0
Unrealized Losses, Less than 12 Months	$ (1,296)	$ 0
Number of positions, 12 Months or More | security	117	124
Fair value, 12 Months or More	$ 227,737	$ 248,044
Unrealized Losses, 12 Months or More	$ (30,288)	$ (29,516)
Number of positions | security	124	124
Fair Value	$ 245,048	$ 248,044
Unrealized Losses	$ (31,584)	$ (29,516)
Other debt securities
Available for Sale:
Number of positions, Less than 12 Months | security	12	10
Fair Value, Less than 12 Months	$ 150,891	$ 191,504
Unrealized Losses, Less than 12 Months	$ (293)	$ (1,347)
Number of positions, 12 Months or More | security	10	8
Fair value, 12 Months or More	$ 68,947	$ 14,571
Unrealized Losses, 12 Months or More	$ (1,993)	$ (967)
Number of positions | security	22	18
Fair Value	$ 219,838	$ 206,075
Unrealized Losses	$ (2,286)	$ (2,314)
Held to Maturity:
Number of positions, Less than 12 Months | security	0	0
Fair Value, Less than 12 Months	$ 0	$ 0
Unrealized Losses, Less than 12 Months	$ 0	$ 0
Number of positions, 12 Months or More | security	10	10
Fair value, 12 Months or More	$ 40,547	$ 45,351
Unrealized Losses, 12 Months or More	$ (2,400)	$ (2,062)
Number of positions | security	10	10
Fair Value	$ 40,547	$ 45,351
Unrealized Losses	$ (2,400)	$ (2,062)
Agency mortgage-backed securities | Residential mortgage-backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	18	8
Fair Value, Less than 12 Months	$ 408,243	$ 135,320
Unrealized Losses, Less than 12 Months	$ (2,236)	$ (903)
Number of positions, 12 Months or More | security	38	36
Fair value, 12 Months or More	$ 192,999	$ 132,975
Unrealized Losses, 12 Months or More	$ (16,159)	$ (14,772)
Number of positions | security	56	44
Fair Value	$ 601,242	$ 268,295
Unrealized Losses	$ (18,395)	$ (15,675)
Held to Maturity:
Number of positions, Less than 12 Months | security	4	0
Fair Value, Less than 12 Months	$ 44,100	$ 0
Unrealized Losses, Less than 12 Months	$ (728)	$ 0
Number of positions, 12 Months or More | security	62	66
Fair value, 12 Months or More	$ 256,832	$ 313,963
Unrealized Losses, 12 Months or More	$ (11,713)	$ (10,030)
Number of positions | security	66	66
Fair Value	$ 300,932	$ 313,963
Unrealized Losses	$ (12,441)	$ (10,030)
Agency mortgage-backed securities | Commercial mortgage-backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	8	9
Fair Value, Less than 12 Months	$ 46,283	$ 71,188
Unrealized Losses, Less than 12 Months	$ (180)	$ (395)
Number of positions, 12 Months or More | security	1	2
Fair value, 12 Months or More	$ 4,680	$ 5,595
Unrealized Losses, 12 Months or More	$ (281)	$ (367)
Number of positions | security	9	11
Fair Value	$ 50,963	$ 76,783
Unrealized Losses	$ (461)	$ (762)
Held to Maturity:
Number of positions, Less than 12 Months | security	0	0
Fair Value, Less than 12 Months	$ 0	$ 0
Unrealized Losses, Less than 12 Months	$ 0	$ 0
Number of positions, 12 Months or More | security	1	1
Fair value, 12 Months or More	$ 14,823	$ 14,879
Unrealized Losses, 12 Months or More	$ (2,079)	$ (2,059)
Number of positions | security	1	1
Fair Value	$ 14,823	$ 14,879
Unrealized Losses	$ (2,079)	$ (2,059)
Collateralized mortgage obligations | Residential mortgage-backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	2	2
Fair Value, Less than 12 Months	$ 73,544	$ 24,816
Unrealized Losses, Less than 12 Months	$ (333)	$ (58)
Number of positions, 12 Months or More | security	38	37
Fair value, 12 Months or More	$ 287,019	$ 299,606
Unrealized Losses, 12 Months or More	$ (62,251)	$ (57,850)
Number of positions | security	40	39
Fair Value	$ 360,563	$ 324,422
Unrealized Losses	$ (62,584)	$ (57,908)
Held to Maturity:
Number of positions, Less than 12 Months | security	0	0
Fair Value, Less than 12 Months	$ 0	$ 0
Unrealized Losses, Less than 12 Months	$ 0	$ 0
Number of positions, 12 Months or More | security	18	18
Fair value, 12 Months or More	$ 289,613	$ 301,657
Unrealized Losses, 12 Months or More	$ (23,348)	$ (18,600)
Number of positions | security	18	18
Fair Value	$ 289,613	$ 301,657
Unrealized Losses	$ (23,348)	$ (18,600)
Collateralized mortgage obligations | Commercial mortgage-backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	24	12
Fair Value, Less than 12 Months	$ 107,519	$ 40,387
Unrealized Losses, Less than 12 Months	$ (635)	$ (56)
Number of positions, 12 Months or More | security	26	25
Fair value, 12 Months or More	$ 102,716	$ 102,206
Unrealized Losses, 12 Months or More	$ (18,163)	$ (18,064)
Number of positions | security	50	37
Fair Value	$ 210,235	$ 142,593
Unrealized Losses	$ (18,798)	$ (18,120)
Held to Maturity:
Number of positions, Less than 12 Months | security	0	0
Fair Value, Less than 12 Months	$ 0	$ 0
Unrealized Losses, Less than 12 Months	$ 0	$ 0
Number of positions, 12 Months or More | security	9	9
Fair value, 12 Months or More	$ 35,847	$ 36,083
Unrealized Losses, 12 Months or More	$ (6,004)	$ (5,997)
Number of positions | security	9	9
Fair Value	$ 35,847	$ 36,083
Unrealized Losses	$ (6,004)	$ (5,997)