Investment Securities - Available for Sale (Details) $ in Thousands	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Sep. 30, 2022 USD ($) security
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 589,603	$ 639,095	$ 646,825
Gross Unrealized Gains	1	80	3
Gross Unrealized Losses	(70,364)	(65,680)	(71,774)
Available-for-Sale at Fair Value	519,240	573,495	575,054
Maturities of Debt Securities, at Amortized Cost:
Within One Year	15,586
From 1 - 5 Years	390,671
From 5 - 10 Years	183,346
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	15,305
From 1 - 5 Years	355,384
From 5 - 10 Years	148,551
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	26,176	250,558	345,910
12 Months or Longer	492,496	293,555	228,674
Total	$ 518,672	$ 544,113	$ 574,584
Number of Securities in a Continuous Loss Position | security	180	174	181
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 403	$ 22,066	$ 34,102
12 Months or Longer	69,961	43,614	37,672
Total	70,364	65,680	71,774
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral, at Fair Value	390,923	308,266	414,929
U.S. Government & Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	190,000	190,000	180,000
Gross Unrealized Gains	0	15	0
Gross Unrealized Losses	(13,579)	(14,816)	(16,035)
Available-for-Sale at Fair Value	176,421	175,199	163,965
Maturities of Debt Securities, at Amortized Cost:
Within One Year	15,000
From 1 - 5 Years	175,000
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	14,736
From 1 - 5 Years	161,685
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	14,914	66,690	71,419
12 Months or Longer	161,506	93,493	92,545
Total	$ 176,420	$ 160,183	$ 163,964
Number of Securities in a Continuous Loss Position | security	25	23	24
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 86	$ 3,310	$ 3,581
12 Months or Longer	13,493	11,506	12,454
Total	13,579	14,816	16,035
U.S. Government & Agency Obligations | Agency Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	190,000	190,000	180,000
Available-for-Sale at Fair Value	176,421	175,199	163,965
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	280	340	340
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Available-for-Sale at Fair Value	280	340	340
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	280
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	280
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position | security	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
State and Municipal Obligations | Municipal Bonds
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	280	340	340
Available-for-Sale at Fair Value	280	340	340
Mortgage- Backed Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	398,323	447,755	465,485
Gross Unrealized Gains	1	65	3
Gross Unrealized Losses	(56,585)	(50,664)	(55,539)
Available-for-Sale at Fair Value	341,739	397,156	409,949
Maturities of Debt Securities, at Amortized Cost:
Within One Year	586
From 1 - 5 Years	215,671
From 5 - 10 Years	182,066
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	569
From 1 - 5 Years	193,699
From 5 - 10 Years	147,471
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	11,262	183,868	274,491
12 Months or Longer	330,190	199,262	135,329
Total	$ 341,452	$ 383,130	$ 409,820
Number of Securities in a Continuous Loss Position | security	154	150	156
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 317	$ 18,756	$ 30,521
12 Months or Longer	56,268	31,908	25,018
Total	56,585	50,664	55,539
Mortgage- Backed Securities | US Government Agencies Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	7,416	7,934	8,243
Available-for-Sale at Fair Value	6,885	7,433	7,842
Mortgage- Backed Securities | US Government-sponsored Enterprises Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	390,907	439,821	457,242
Available-for-Sale at Fair Value	334,854	389,723	402,107
Corporate and Other Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	1,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(200)	(200)	(200)
Available-for-Sale at Fair Value	800	800	800
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	1,000
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	800
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	800	800	800
Total	$ 800	$ 800	$ 800
Number of Securities in a Continuous Loss Position | security	1	1	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	200	200	200
Total	200	200	200
Corporate and Other Debt Securities | Corporate Trust Preferred Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	1,000
Available-for-Sale at Fair Value	$ 800	$ 800	$ 800