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Investments (Unrealized Gross Losses and Estimated Fair values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	$ 100,011	$ 324,078
Unrealized Losses - Less Than 12 Months	(599)	(3,089)
Fair Value - 12 Months or More	621,294	398,360
Unrealized Losses - 12 Months or More	(23,937)	(11,172)
Fair Value	721,305	722,438
Unrealized Losses	(24,536)	(14,261)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	509	9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5)	(57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	411	9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(19)	(180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	920	18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(24)	(237)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	11,378
Unrealized Losses - Less Than 12 Months	(26)
Fair Value - 12 Months or More	966
Unrealized Losses - 12 Months or More	(21)
Fair Value	12,344
Unrealized Losses	(47)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	46,459	221,466
Unrealized Losses - Less Than 12 Months	(252)	(2,393)
Fair Value - 12 Months or More	364,430	233,971
Unrealized Losses - 12 Months or More	(13,272)	(5,078)
Fair Value	410,889	455,437
Unrealized Losses	(13,524)	(7,471)
Collateralized Mortgage Obligations Issued By United States Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	5,956	102,612
Unrealized Losses - Less Than 12 Months	(40)	(696)
Fair Value - 12 Months or More	227,461	164,389
Unrealized Losses - 12 Months or More	(10,031)	(6,094)
Fair Value	233,417	267,001
Unrealized Losses	(10,071)	(6,790)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	36,218
Unrealized Losses - Less Than 12 Months	(281)
Fair Value - 12 Months or More	28,437
Unrealized Losses - 12 Months or More	(613)
Fair Value	64,655
Unrealized Losses	(894)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	509	9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5)	(57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	411	9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(19)	(180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	920	18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (24)	$ (237)

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