Investment Securities, Debt Securities by Credit Rating (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Fair value		$ 251,375	$ 270,454
Held-to-Maturity [Abstract]
Amortized cost		876,257	737,052
AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value		9,835
Held-to-Maturity [Abstract]
Amortized cost		19,715
BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		134
Not Rated [Member]
Available-for-sale [Abstract]
Fair value		241,540
Held-to-Maturity [Abstract]
Amortized cost		856,408
U.S. Treasury Notes [Member]
Available-for-sale [Abstract]
Fair value		9,996	10,089
U.S. Treasury Notes [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
U.S. Treasury Notes [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
U.S. Treasury Notes [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value	[1]	9,996
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
U.S. Government-sponsored Securities [Member]
Available-for-sale [Abstract]
Fair value		5,789	6,374
U.S. Government-sponsored Securities [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
U.S. Government-sponsored Securities [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
U.S. Government-sponsored Securities [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value		5,789
Held-to-Maturity [Abstract]
Amortized cost		0
Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Fair value	[2]	223,901	251,120
Held-to-Maturity [Abstract]
Amortized cost	[3]	695,249	596,775
Mortgage-backed Securities [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
Mortgage-backed Securities [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
Mortgage-backed Securities [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value	[1]	223,901
Held-to-Maturity [Abstract]
Amortized cost	[1]	695,249
Collateralized Mortgage Obligations [Member]
Available-for-sale [Abstract]
Fair value	[2]	1,544	2,436
Held-to-Maturity [Abstract]
Amortized cost	[3]	117,427	73,781
Collateralized Mortgage Obligations [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
Collateralized Mortgage Obligations [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value	[1]	0
Held-to-Maturity [Abstract]
Amortized cost	[1]	0
Collateralized Mortgage Obligations [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value	[1]	1,544
Held-to-Maturity [Abstract]
Amortized cost	[1]	117,427
Obligations of States and Political Subdivisions [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		19,715
Obligations of States and Political Subdivisions [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		134
Obligations of States and Political Subdivisions [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		43,732
Corporate Securities [Member]
Available-for-sale [Abstract]
Fair value		9,835
Corporate Securities [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value		9,835
Held-to-Maturity [Abstract]
Amortized cost		0
Corporate Securities [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
Corporate Securities [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
Other [Member]
Available-for-sale [Abstract]
Fair value		310	$ 435
Other [Member] | AAA/AA/A Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
Other [Member] | BBB/BB/B Rating [Member]
Available-for-sale [Abstract]
Fair value		0
Held-to-Maturity [Abstract]
Amortized cost		0
Other [Member] | Not Rated [Member]
Available-for-sale [Abstract]
Fair value		310
Held-to-Maturity [Abstract]
Amortized cost		$ 0

[1] All mortgage-backed securities and collateralized mortgage obligations were issued by an agency or government sponsored entity of the U.S. Government. All U.S. Treasury notes are backed by the “full faith and credit” of the U.S. Government.

[2] All mortgage-backed securities and collateralized mortgage obligations were issued by an agency or government sponsored entity of the U.S. Government.

[3] All mortgage-backed securities and collateralized mortgage obligations were issued by an agency or government sponsored entity of the U.S. Government.