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Fair Value Measurements (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance $ 104,344 $ 100,307
Total gains or losses (realized/unrealized) included in earnings (6,922) (820)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2) 246
Investment securities called (2,000) (4,635)
Discount accretion 117 84
Purchases of private equity securities 10,684 15,706
Sale / paydown of private equity securities (364) (6,548)
Capitalized interest/dividends 29 32
Purchase of risk participation agreement 0 439
Sale of risk participation agreement (809) (467)
Ending balance 105,077 104,344
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end (6,472) (1,720)
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total 44 0
State and Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance 9,853 14,158
Total gains or losses (realized/unrealized) included in earnings 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2) 246
Investment securities called (2,000) (4,635)
Discount accretion 117 84
Purchases of private equity securities 0 0
Sale / paydown of private equity securities 0 0
Capitalized interest/dividends 0 0
Purchase of risk participation agreement 0 0
Sale of risk participation agreement 0 0
Ending balance 7,968 9,853
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end 0 0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total 44 0
Private Equity Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance 94,122 85,659
Total gains or losses (realized/unrealized) included in earnings (10,103) (727)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0
Investment securities called 0 0
Discount accretion 0 0
Purchases of private equity securities 10,684 15,706
Sale / paydown of private equity securities (364) (6,548)
Capitalized interest/dividends 29 32
Purchase of risk participation agreement 0 0
Sale of risk participation agreement 0 0
Ending balance 94,368 94,122
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end (10,083) (2,177)
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total 0 0
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance 369 490
Total gains or losses (realized/unrealized) included in earnings 3,181 (93)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0
Investment securities called 0 0
Discount accretion 0 0
Purchases of private equity securities 0 0
Sale / paydown of private equity securities 0 0
Capitalized interest/dividends 0 0
Purchase of risk participation agreement 0 439
Sale of risk participation agreement (809) (467)
Ending balance 2,741 369
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end 3,611 457
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total $ 0 $ 0