Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities		$ 242,720
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities		242,720
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	$ 1,032,265	849,161
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,032,265	849,161
Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,902	1,935
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,478	1,518
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	424	417
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,902	1,935
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,478	1,518
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	424	417
Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Swap [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Cash and Cash Equivalents, Fair Value Disclosure	144,604	169,112
Mortgage loans held for sale	6,441	4,148
Investment securities	1,376,606	1,455,660
Loans Held-for-sale, Fair Value Disclosure	6,441	4,148
Impaired Loan Fair Value	6,247	3,574
Other Assets, Fair Value Disclosure	5,493,865	5,247,021
Loans Receivable, Fair Value Disclosure	5,506,681	5,254,837
Time deposits	1,089,966	1,035,093
Other Liabilities, Fair Value Disclosure	5,186	1,269
Deposits, Fair Value Disclosure	1,095,152	1,036,362
Short Term Borrowings Fair Value	179,818	391,289
Long-term debt	397,640	504,503
Subordinated Debt Obligations, Fair Value Disclosure	12,987	13,370
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	144,604	169,112
Mortgage IRLCs	0	0
Other Liabilities, Fair Value Disclosure	5,186	1,269
Deposits, Fair Value Disclosure	5,186	1,269
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	128	94
Investment securities	1,376,606	1,455,660
Loans Held-for-sale, Fair Value Disclosure	6,441	4,148
Loans Receivable, Fair Value Disclosure	6,569	4,242
Time deposits	1,089,966	1,035,093
Deposits, Fair Value Disclosure	1,089,966	1,035,093
Short Term Borrowings Fair Value	179,818	391,289
Long-term debt	397,640	504,503
Subordinated Debt Obligations, Fair Value Disclosure	12,987	13,370
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	6,247	3,574
Other Assets, Fair Value Disclosure	5,493,865	5,247,021
Loans Receivable, Fair Value Disclosure	5,500,112	5,250,595
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	6,441	4,148
Mortgage IRLCs	128	94
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	6,441	4,148
Mortgage IRLCs	128	94
Reported Value Measurement [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,902	1,935
Reported Value Measurement [Member] | Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Reported Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	144,604	169,112
Mortgage IRLCs	128	94
Investment securities	1,382,907	1,449,078
Loans Held-for-sale, Fair Value Disclosure	6,441	4,148
Impaired Loan Fair Value	6,247	3,574
Other Assets, Fair Value Disclosure	5,562,261	5,314,679
Loans Receivable, Fair Value Disclosure	5,575,077	5,322,495
Time deposits	1,090,117	1,033,476
Other Liabilities, Fair Value Disclosure	5,186	1,269
Deposits, Fair Value Disclosure	1,095,303	1,034,745
Short Term Borrowings Fair Value	179,818	391,289
Long-term debt	400,000	500,000
Subordinated Debt Obligations, Fair Value Disclosure	$ 15,000	$ 15,000