Investment Securities Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	$ 6,676
Amortized cost of securities maturing in 1-5 years	39,962
Amortized cost of securities maturing in 5-10 years	132,742
Amortized cost of securities maturing in over 10 years	750,015
Amortized Cost	929,395	$ 804,655
Fair value of securities maturing within 1 year	6,691
Fair value of securities maturing in 1-5 years	40,484
Fair value of securities maturing in 5-10 years	134,386
Fair value of securities maturing in over 10 years	754,540
Fair Value	$ 936,101	791,891
Average yield of securities maturing within 1 year	2.32%
Average yield of securities maturing in 1-5 years	2.63%
Average yield of securities maturing in 5-10 years	2.71%
Average yield of securities maturing in over 10 years	2.67%
Total average yield	2.68%
US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	$ 0
Amortized cost of securities maturing in 1-5 years	1,993
Amortized cost of securities maturing in 5-10 years	5,924
Amortized cost of securities maturing in over 10 years	0
Total amortized cost	7,917
Amortized Cost	7,917
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	2,045
Fair value of securities maturing in 5-10 years	6,164
Fair value of securities maturing in over 10 years	0
Total fair value	8,209
Fair Value	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	4,303
Amortized cost of securities maturing in 1-5 years	24,842
Amortized cost of securities maturing in 5-10 years	43,699
Amortized cost of securities maturing in over 10 years	38,373
Total amortized cost	111,217
Amortized Cost	111,217	88,358
Fair value of securities maturing within 1 year	4,316
Fair value of securities maturing in 1-5 years	25,224
Fair value of securities maturing in 5-10 years	45,445
Fair value of securities maturing in over 10 years	39,119
Total fair value	114,104
Fair Value	114,104	88,587
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	1
Amortized cost of securities maturing in 1-5 years	1,860
Amortized cost of securities maturing in 5-10 years	77,441
Amortized cost of securities maturing in over 10 years	708,128
Total amortized cost	787,430
Amortized Cost	787,430	705,289
Fair value of securities maturing within 1 year	1
Fair value of securities maturing in 1-5 years	1,890
Fair value of securities maturing in 5-10 years	77,076
Fair value of securities maturing in over 10 years	712,042
Total fair value	791,009
Fair Value	791,009	692,608
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	2,372
Amortized cost of securities maturing in 1-5 years	11,267
Amortized cost of securities maturing in 5-10 years	982
Amortized cost of securities maturing in over 10 years	3,514
Total amortized cost	18,135
Amortized Cost	18,135	6,812
Fair value of securities maturing within 1 year	2,374
Fair value of securities maturing in 1-5 years	11,325
Fair value of securities maturing in 5-10 years	1,010
Fair value of securities maturing in over 10 years	3,379
Total fair value	18,088
Fair Value	18,088	6,707
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing in 5-10 years	4,696
Amortized cost of securities maturing in over 10 years	0
Total amortized cost	4,696
Amortized Cost	4,696	4,196
Fair value of securities maturing in 5-10 years	4,691
Fair value of securities maturing in over 10 years	0
Total fair value	4,691
Fair Value	$ 4,691	$ 3,989

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