Securities - Schedule of Government-Sponsored Residential Mortgage-Backed Securities with Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2024 USD ($) holding	Dec. 31, 2023 USD ($) holding
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	772	736
Gross Unrealized Losses
Less than 12 Months	$ 521	$ 269
12 Months or Longer	790,969	754,286
Total	791,490	754,555
Fair Value
Less than 12 Months	35,652	27,821
12 Months or Longer	4,245,992	4,346,529
Total	$ 4,281,644	$ 4,374,350
Government-sponsored residential mortgage-backed securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	324	324
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	545,484	521,527
Total	545,484	521,527
Fair Value
Less than 12 Months	0	0
12 Months or Longer	2,683,627	2,780,638
Total	$ 2,683,627	$ 2,780,638
Government-sponsored commercial mortgage-backed securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	187	187
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	209,103	201,653
Total	209,103	201,653
Fair Value
Less than 12 Months	0	0
12 Months or Longer	1,106,783	1,124,376
Total	$ 1,106,783	$ 1,124,376
U.S. Agency bonds
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	23	23
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 0
12 Months or Longer	21,523	20,443
Total	21,523	20,443
Fair Value
Less than 12 Months	0	0
12 Months or Longer	215,238	216,011
Total	$ 215,238	$ 216,011
U.S. Treasury securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	6	6
Gross Unrealized Losses
Less than 12 Months	$ 61	$ 36
12 Months or Longer	4,464	4,364
Total	4,525	4,400
Fair Value
Less than 12 Months	4,907	4,927
12 Months or Longer	90,178	90,225
Total	$ 95,085	$ 95,152
State and municipal bonds and obligations
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings | holding	232	196
Gross Unrealized Losses
Less than 12 Months	$ 460	$ 233
12 Months or Longer	10,395	6,299
Total	10,855	6,532
Fair Value
Less than 12 Months	30,745	22,894
12 Months or Longer	150,166	135,279
Total	$ 180,911	$ 158,173