Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 3,480,000
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	3,480,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	16,250,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	16,250,000
Other Debt Obligations [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	6,311,000
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	6,311,000
U S Government Sponsored Entities Asset Backed Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	952,784,000	$ 1,003,421,000
U S Government Sponsored Entities Asset Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	952,784,000	1,003,421,000
Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,832,000	1,649,000
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,399,000	1,225,000
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	433,000	424,000
Equity Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	1,832,000	1,649,000
Equity Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	1,399,000	1,225,000
Equity Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments, Fair Value Disclosure	433,000	424,000
Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226,000	226,000
Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	642,000
Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226,000	226,000
Swap [Member] | Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226,000	226,000
Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226,000	226,000
Cash and Cash Equivalents, Fair Value Disclosure	259,505,000	167,214,000
Mortgage loans held for sale	13,000,000.0	4,200,000
Mortgage IRLCs	361,000	87,000
Investment securities	1,343,385,000	1,354,843,000
Loans Held-for-sale, Fair Value Disclosure	13,033,000	4,158,000
Impaired Loan Fair Value	4,212,000	6,399,000
Other Assets, Fair Value Disclosure	6,294,891,000	5,570,136,000
Loans Receivable, Fair Value Disclosure	6,312,497,000	5,580,780,000
Time deposits	1,133,461,000	1,044,620,000
Other Liabilities, Fair Value Disclosure	3,996,000	1,267,000
Deposits, Fair Value Disclosure	1,137,457,000	1,045,887,000
Short Term Borrowings Fair Value	180,578,000	221,966,000
Long-term debt	407,248,000	400,203,000
Subordinated Debt Obligations, Fair Value Disclosure	13,566,000	12,959,000
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	642,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	259,505,000	167,214,000
Mortgage IRLCs	0	0
Other Liabilities, Fair Value Disclosure	3,996,000	1,267,000
Deposits, Fair Value Disclosure	3,996,000	1,267,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	361,000	87,000
Investment securities	1,343,385,000	1,354,843,000
Loans Held-for-sale, Fair Value Disclosure	13,033,000	4,158,000
Loans Receivable, Fair Value Disclosure	13,394,000	4,245,000
Time deposits	1,133,461,000	1,044,620,000
Deposits, Fair Value Disclosure	1,133,461,000	1,044,620,000
Short Term Borrowings Fair Value	180,578,000	221,966,000
Long-term debt	407,248,000	400,203,000
Subordinated Debt Obligations, Fair Value Disclosure	13,566,000	12,959,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Impaired Loan Fair Value	4,212,000	6,399,000
Other Assets, Fair Value Disclosure	6,294,891,000	5,570,136,000
Loans Receivable, Fair Value Disclosure	6,299,103,000	5,576,535,000
Fair Value, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	13,033,000	4,158,000
Mortgage IRLCs	361,000	87,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	13,033,000	4,158,000
Mortgage IRLCs	361,000	87,000
Reported Value Measurement [Member] | Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,832,000	1,649,000
Reported Value Measurement [Member] | Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226,000	226,000
Reported Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	259,505,000	167,214,000
Mortgage IRLCs	361,000	87,000
Investment securities	1,329,200,000	1,355,229,000
Loans Held-for-sale, Fair Value Disclosure	13,033,000	4,158,000
Impaired Loan Fair Value	4,212,000	6,399,000
Other Assets, Fair Value Disclosure	6,305,128,000	5,629,976,000
Loans Receivable, Fair Value Disclosure	6,322,734,000	5,640,620,000
Time deposits	1,131,310,000	1,043,177,000
Other Liabilities, Fair Value Disclosure	3,996,000	1,267,000
Deposits, Fair Value Disclosure	1,135,306,000	1,044,444,000
Short Term Borrowings Fair Value	180,578,000	221,966,000
Long-term debt	400,000,000	400,000,000
Subordinated Debt Obligations, Fair Value Disclosure	$ 15,000,000	$ 15,000,000