Securities (Securities in a Continuous Unrealized Loss Position) (Details) $ in Thousands	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	2	7
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 10,612	$ 61,514
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ (33)	$ (192)
Number of securities in a continuous unrealized loss position for 12 months or longer | security	8	34
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 20,752	$ 289,468
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ (3,727)	$ (4,708)
Number of securities in a continuous unrealized loss position total | security	10	41
Fair value of securities in a continuous unrealized loss position total	$ 31,364	$ 350,982
Unrealized losses of securities in a continuous unrealized loss position total	$ (3,760)	$ (4,900)
Obligations of U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security		3
Fair value of securities in a continuous unrealized loss position for less than 12 months		$ 20,364
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months		$ (136)
Number of securities in a continuous unrealized loss position for 12 months or longer | security		3
Fair value of securities in a continuous unrealized loss position for 12 months or longer		$ 49,902
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer		$ (97)
Number of securities in a continuous unrealized loss position total | security		6
Fair value of securities in a continuous unrealized loss position total		$ 70,266
Unrealized losses of securities in a continuous unrealized loss position total		$ (233)
Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	2	4
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 10,612	$ 41,150
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ (33)	$ (56)
Number of securities in a continuous unrealized loss position for 12 months or longer | security	0	23
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ 216,804
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ (2,908)
Number of securities in a continuous unrealized loss position total | security	2	27
Fair value of securities in a continuous unrealized loss position total	$ 10,612	$ 257,954
Unrealized losses of securities in a continuous unrealized loss position total	$ (33)	$ (2,964)
Individual name issuer trust preferred debt securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Number of securities in a continuous unrealized loss position for 12 months or longer | security	5	5
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 11,729	$ 12,579
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ (1,603)	$ (745)
Number of securities in a continuous unrealized loss position total | security	5	5
Fair value of securities in a continuous unrealized loss position total	$ 11,729	$ 12,579
Unrealized losses of securities in a continuous unrealized loss position total	$ (1,603)	$ (745)
Corporate bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Number of securities in a continuous unrealized loss position for 12 months or longer | security	3	3
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 9,023	$ 10,183
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ (2,124)	$ (958)
Number of securities in a continuous unrealized loss position total | security	3	3
Fair value of securities in a continuous unrealized loss position total	$ 9,023	$ 10,183
Unrealized losses of securities in a continuous unrealized loss position total	$ (2,124)	$ (958)