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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Apr. 12, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value | $ 1,036,782,000 | $ 735,393,000 |
Auction rate securities, firm purchased and hold | 87,100,000 |  |
Amount of ARS committed to purchase from clients | 32,500,000 |  |
Valuation adjustment (unrealized loss) for ARS | $ 1,959,000 |  |
Interest rate | 8.75% |  | 8.75%
Loans held for sale period (in days) | 60 days |  |
Maximum period held for sale (in days) | 90 days |  |
Book value of loan held for sale | $ 12,700,000 |  |
Mortgages Held-for-sale, Fair Value Disclosure | 13,532,000 |  |
Loans held for sale | $ 13,532,000 | 60,234,000 |
Forward or delayed delivery of the underlying instrument with settlement (in days) | 180 days |  |
Maximum [Member] | LIBOR or Treasury Yield [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Auction market preferred securities variable interest rate earned | 200.00% |  |
Auction Rate Securities [Member] | Fair Value, Valuation Scenario Two [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Change in discount rate | 50.00% |  |
Decrease in fair value of ARS | $ 2,200,000 |  |
Auction Rate Securities [Member] | Fair Value, Valuation Scenario One [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Change in discount rate | 25.00% |  |
Decrease in fair value of ARS | $ 1,100,000 |  |
Auction Rate Securities [Member] | Maximum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Commitment to purchase ARS period maximum | 2020 |  |
Mortgage Servicing Rights [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Permanent and construction loans , discount rate | 12.00% |  |
Continuous prepayment rate used up to loans prepayment penalty rate hit 4% | 0.00% |  |
Continuous prepayment rate | 4.00% |  |
Continuous prepayment rate vast majority range minimum | 10.00% |  |
Continuous prepayment rate vast majority range maximum | 15.00% |  |
Continuous prepayment rate vast majority range average rate | 12.00% |  |
Estimated future cost to service loans on an annual basis per loan, average | $ 1,250 |  |
Auction Rate Securities Purchase Commitment [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | (981,000) |  |
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | (1,540,000) |  |
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities 01 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | $ 559,000 |  |
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Permanent and construction loans , discount rate | 1.56% |  |
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities 01 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Permanent and construction loans , discount rate | 1.56% |  |
Equity Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value | $ 44,964,000 | 34,475,000 |
Auction Rate Securities Owned [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | 2,940,000 |  |
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | $ 2,406,000 |  |
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Permanent and construction loans , discount rate | 1.56% |  |
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Equity Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, including amounts pledged of $705,835 ($546,334 in 2015), at fair value | $ 13,500,000 | $ 14,000,000 |

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