Investment Securities - Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) position	Dec. 31, 2021 USD ($) position	Dec. 31, 2020 USD ($)
Securities
Percentage of AFS investment portfolio	95.00%	88.00%
Percentage of HTM investment portfolio	22.00%
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	$ 49,545	$ 247,165
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	258,411	24,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 307,956	$ 271,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Number of Positions | position	37	27
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	$ 247,182
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 247,182
Held-to-maturity Securities, Fair Value, Number of Positions | position	2	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	$ 1,493	$ 1,866
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	12,565	172
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	14,058	2,038
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	124
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	124
Treasury notes
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	29,560	7,957
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	5,798
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	35,358	7,957
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	762	27
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	193
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	955	27
Federal agencies
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	19,276	238,489	$ 69,939
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	252,613	24,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	271,889	263,295
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Number of Positions			69,939
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	724	1,503	$ 17
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	12,372	172
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	13,096	1,675	$ 17
Mortgage-backed - Government-sponsored entity (GSE)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	709	719
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	709	719
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	7	336
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	7	$ 336
Mortgage-backed - Non-GSE residential
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	247,182
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	247,182
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	124
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ 124