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Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) $ in Thousands | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) holding
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | $ 777,798 | $ 740,806
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 31,700 | 13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (143) | (971)
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 809,355 | 753,263
Small Business Administration Pooled Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value |  | 7,349
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss |  | 55
Debt Securities, Held-to-maturity | 30,716 | 31,324
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 745 | 338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (55)
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 31,461 | $ 31,607
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding |  | 1
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value |  | $ 7,349
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months |  | (55)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value |  | 0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months |  | 0
Trust Preferred Securities Subject to Mandatory Redemption [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10) | (10)
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 1,490 | 1,490
Collateralized Debt Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value |  | 85,858
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss |  | 868
Debt Securities, Held-to-maturity | 277,921 | 293,662
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 11,981 | 4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (849)
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 289,902 | $ 297,314
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding |  | 17
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value |  | $ 48,476
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months |  | (215)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value |  | 37,382
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months |  | 653
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value |  | 34,252
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss |  | 61
Debt Securities, Held-to-maturity | 463,632 | 397,414
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 18,864 | 8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (133) | (57)
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 482,363 | $ 405,802
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding |  | 12
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value |  | $ 34,009
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months |  | (59)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value |  | 243
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months |  | 2
US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 4,029 | 4,032
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 110 | 21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | 4,139 | 4,053
U.S. government agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 0 | 12,874
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt Securities, Held-to-maturity, Fair Value | $ 0 | 12,997
Equity Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value |  | 130,063
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Loss |  | $ 1,368
Available for Sale and Held to Maturity Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions | holding |  | 32
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value |  | $ 89,834
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months |  | (329)
Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value |  | 40,229
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months |  | $ 1,039

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