Investment Securities (Portfolio Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available for Sale, Amortized Cost
Within 1 year	$ 12,797	$ 12,041
After 1 year through 5 years	217,569	195,701
After 5 years through 10 years	93,805	115,665
Over 10 years	171,994	191,843
AFS, debt securities, amortized cost	496,165	515,250
Available for Sale, Estimated Fair Value
Within 1 year	12,804	12,007
After 1 year through 5 years	220,757	192,692
After 5 years through 10 years	94,212	112,819
Over 10 years	171,222	185,275
Total	$ 498,995	$ 502,793
Available for Sale, Weighted Average Rate
Within 1 year (as a percent)	1.76%	2.03%
After 1 year through 5 years (as a percent)	2.19%	2.14%
After 5 years through 10 years (as a percent)	2.04%	2.18%
Over 10 years (as a percent)	2.12%	2.17%
Total (as a percent)	2.13%	2.16%
Held-to-Maturity, Amortized Cost
Within 1 year	$ 6,366	$ 7,640
After 1 year through 5 years	63,898	72,735
After 5 years through 10 years	7,177	23,025
Over 10 years	9,339	11,376
Total	86,780	114,776
Held-to-Maturity, Estimated Fair Value
Within 1 year	6,381	7,618
After 1 year through 5 years	64,559	71,492
After 5 years through 10 years	7,364	22,640
Over 10 years	9,257	11,080
Total	$ 87,561	$ 112,830
Held-to-Maturity, Weighted Average Rate
Within 1 year (as a percent)	1.33%	1.17%
After 1 year through 5 years (as a percent)	1.81%	1.84%
After 5 years through 10 years (as a percent)	1.79%	2.20%
Over 10 years (as a percent)	1.90%	2.13%
Total (as a percent)	1.82%	1.89%