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Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | $ 13,073 | $ 11,254
Derivatives Designated as Hedging Instruments [Member] | Other Noninterest Income [Member] | Customer and All Other Instruments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | 1,192 | 5,035
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Interest Income [Member] | Interest Rate Swaps - Variable Rate Loans [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | 6,754 | 6,136
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Interest Income [Member] | Interest Rate Swaps - Securities [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | 1,158 | $ 83
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Securities Transactions Net [Member] | Securities Termination [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | 1,620 |
Derivatives Not Designated as Hedging Instruments [Member] | Secondary Mortgage Market Operations [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative income reflected in income statement | $ (2,349) |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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