Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands	Jun. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Available for Sale:
Number of positions, Less than 12 Months | security	7	6
Fair Value, Less than 12 Months	$ 17,125	$ 6,819
Unrealized Losses, Less than 12 Months	$ (240)	$ (222)
Number of positions, 12 Months or More | security	127	127
Fair value, 12 Months or More	$ 647,383	$ 685,774
Unrealized Losses, 12 Months or More	$ (145,413)	$ (139,572)
Number of positions | security	134	133
Fair Value	$ 664,508	$ 692,593
Unrealized Losses	$ (145,653)	$ (139,794)
Held to Maturity:
Number of positions, Less than 12 Months | security	1	2
Fair Value, Less than 12 Months	$ 2,351	$ 2,807
Unrealized Losses, Less than 12 Months	$ (33)	$ (25)
Number of positions, 12 Months or More | security	235	234
Fair Value, 12 Months or More	$ 1,048,672	$ 1,117,285
Unrealized Losses, 12 Months or More	$ (121,978)	$ (99,715)
Number of positions | security	236	236
Fair Value	$ 1,051,023	$ 1,120,092
Unrealized Losses	$ (122,011)	$ (99,740)
Obligations of states and political subdivisions
Available for Sale:
Number of positions, Less than 12 Months | security	0	3
Fair Value, Less than 12 Months	$ 0	$ 2,914
Unrealized Losses, Less than 12 Months	$ 0	$ (2)
Number of positions, 12 Months or More | security	7	9
Fair value, 12 Months or More	$ 12,928	$ 15,198
Unrealized Losses, 12 Months or More	$ (2,273)	$ (1,881)
Number of positions | security	7	12
Fair Value	$ 12,928	$ 18,112
Unrealized Losses	$ (2,273)	$ (1,883)
Held to Maturity:
Number of positions, Less than 12 Months | security	1	2
Fair Value, Less than 12 Months	$ 2,351	$ 2,807
Unrealized Losses, Less than 12 Months	$ (33)	$ (25)
Number of positions, 12 Months or More | security	127	126
Fair Value, 12 Months or More	$ 241,015	$ 249,995
Unrealized Losses, 12 Months or More	$ (41,293)	$ (33,663)
Number of positions | security	128	128
Fair Value	$ 243,366	$ 252,802
Unrealized Losses	$ (41,326)	$ (33,688)
Other debt securities
Available for Sale:
Number of positions, Less than 12 Months | security	0	2
Fair Value, Less than 12 Months	$ 0	$ 3,099
Unrealized Losses, Less than 12 Months	$ 0	$ (195)
Number of positions, 12 Months or More | security	20	19
Fair value, 12 Months or More	$ 37,415	$ 35,072
Unrealized Losses, 12 Months or More	$ (3,791)	$ (4,263)
Number of positions | security	20	21
Fair Value	$ 37,415	$ 38,171
Unrealized Losses	$ (3,791)	$ (4,458)
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	$ 51,418	$ 54,254
Unrealized Losses, 12 Months or More	$ (4,707)	$ (4,119)
Number of positions | security	10	10
Fair Value	$ 51,418	$ 54,254
Unrealized Losses	$ (4,707)	$ (4,119)
Government agency mortgage backed securities | Residential mortgage backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	5	1
Fair Value, Less than 12 Months	$ 9,495	$ 806
Unrealized Losses, Less than 12 Months	$ (109)	$ (25)
Number of positions, 12 Months or More | security	36	35
Fair value, 12 Months or More	$ 154,193	$ 166,963
Unrealized Losses, 12 Months or More	$ (26,271)	$ (24,943)
Number of positions | security	41	36
Fair Value	$ 163,688	$ 167,769
Unrealized Losses	$ (26,380)	$ (24,968)
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	70	70
Fair Value, 12 Months or More	$ 372,441	$ 405,950
Unrealized Losses, 12 Months or More	$ (27,382)	$ (20,314)
Number of positions | security	70	70
Fair Value	$ 372,441	$ 405,950
Unrealized Losses	$ (27,382)	$ (20,314)
Government agency mortgage backed securities | Commercial mortgage backed securities:
Available for Sale:
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	2	2
Fair value, 12 Months or More	$ 5,335	$ 5,392
Unrealized Losses, 12 Months or More	$ (681)	$ (637)
Number of positions | security	2	2
Fair Value	$ 5,335	$ 5,392
Unrealized Losses	$ (681)	$ (637)
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	$ 13,914	$ 14,011
Unrealized Losses, 12 Months or More	$ (3,058)	$ (2,972)
Number of positions | security	1	1
Fair Value	$ 13,914	$ 14,011
Unrealized Losses	$ (3,058)	$ (2,972)
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available for Sale:
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	37	37
Fair value, 12 Months or More	$ 330,955	$ 354,574
Unrealized Losses, 12 Months or More	$ (89,746)	$ (85,883)
Number of positions | security	37	37
Fair Value	$ 330,955	$ 354,574
Unrealized Losses	$ (89,746)	$ (85,883)
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	$ 333,214	$ 355,538
Unrealized Losses, 12 Months or More	$ (38,017)	$ (31,670)
Number of positions | security	18	18
Fair Value	$ 333,214	$ 355,538
Unrealized Losses	$ (38,017)	$ (31,670)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available for Sale:
Number of positions, Less than 12 Months | security	2	0
Fair Value, Less than 12 Months	$ 7,630	$ 0
Unrealized Losses, Less than 12 Months	$ (131)	$ 0
Number of positions, 12 Months or More | security	25	25
Fair value, 12 Months or More	$ 106,557	$ 108,575
Unrealized Losses, 12 Months or More	$ (22,651)	$ (21,965)
Number of positions | security	27	25
Fair Value	$ 114,187	$ 108,575
Unrealized Losses	$ (22,782)	$ (21,965)
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	$ 36,670	$ 37,537
Unrealized Losses, 12 Months or More	$ (7,521)	$ (6,977)
Number of positions | security	9	9
Fair Value	$ 36,670	$ 37,537
Unrealized Losses	$ (7,521)	$ (6,977)