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Securities, Available for Sale (Details) $ in Thousands | Sep. 30, 2016 USD ($) Position | Dec. 31, 2015 USD ($) Position
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,269,713 | $ 1,169,337
Unrealized gains | 20,616 | 9,878
Unrealized losses | (1,430) | (4,671)
Estimated fair value | 1,288,899 | 1,174,544
Amortized costs of securities available for sale pledged to secure public deposits | 1,600,000 | 1,400,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements | 223,800 | 205,900
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 73,871 | 624,819
12 Months or Longer, Fair Value | 6,230 | 29,822
Total, Fair Value | 80,101 | 654,641
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (295) | (4,283)
12 Months or Longer, Unrealized Losses | (1,135) | (388)
Total Unrealized Losses | $ (1,430) | $ (4,671)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 22 | 79
12 Months or Longer, Number of Positions | Position | 7 | 12
Total, Number of Positions | Position | 29 | 91
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Within one year | $ 39,403 |
From one to five years | 245,571 |
From five to ten years | 153,633 |
After ten years | 814,362 |
Total, Amortized Cost | 1,252,969 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Within one year | 39,495 |
From one to five years | 247,544 |
From five to ten years | 156,600 |
After ten years | 824,942 |
Total, Fair Value | 1,268,581 |
Federal Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 255,115 | $ 312,580
Unrealized gains | 1,006 | 203
Unrealized losses | (28) | (1,511)
Estimated fair value | 256,093 | 311,272
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 9,955 | 186,685
12 Months or Longer, Fair Value | 0 | 19,801
Total, Fair Value | 9,955 | 206,486
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (28) | (1,312)
12 Months or Longer, Unrealized Losses | 0 | (199)
Total Unrealized Losses | $ (28) | $ (1,511)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 1 | 15
12 Months or Longer, Number of Positions | Position | 0 | 2
Total, Number of Positions | Position | 1 | 17
State & Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 38,327 | $ 31,208
Unrealized gains | 357 | 446
Unrealized losses | (30) | (17)
Estimated fair value | 38,654 | 31,637
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 7,659 | 4,599
12 Months or Longer, Fair Value | 488 | 502
Total, Fair Value | 8,147 | 5,101
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (28) | (14)
12 Months or Longer, Unrealized Losses | (2) | (3)
Total Unrealized Losses | $ (30) | $ (17)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 12 | 7
12 Months or Longer, Number of Positions | Position | 1 | 1
Total, Number of Positions | Position | 13 | 8
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | $ 0 | $ 177,270
12 Months or Longer, Fair Value | 996 | 1,066
Total, Fair Value | 996 | 178,336
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | 0 | (1,068)
12 Months or Longer, Unrealized Losses | (13) | (14)
Total Unrealized Losses | $ (13) | $ (1,082)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 0 | 33
12 Months or Longer, Number of Positions | Position | 4 | 5
Total, Number of Positions | Position | 4 | 38
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 356,484 | $ 398,086
Unrealized gains | 8,969 | 4,141
Unrealized losses | 0 | (1,068)
Estimated fair value | 365,453 | 401,159
Mortgage-backed Securities, Issued by US Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,418 | 8,191
Unrealized gains | 506 | 560
Unrealized losses | (13) | (14)
Estimated fair value | 6,911 | 8,737
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 56,083 | 256,265
12 Months or Longer, Fair Value | 0 | 5,218
Total, Fair Value | 56,083 | 261,483
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (213) | (1,889)
12 Months or Longer, Unrealized Losses | 0 | (54)
Total Unrealized Losses | $ (213) | $ (1,943)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 8 | 24
12 Months or Longer, Number of Positions | Position | 0 | 2
Total, Number of Positions | Position | 8 | 26
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 536,694 | $ 364,936
Unrealized gains | 4,580 | 931
Unrealized losses | (189) | (1,828)
Estimated fair value | 541,085 | 364,039
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 59,931 | 40,699
Unrealized gains | 478 | 348
Unrealized losses | (24) | (115)
Estimated fair value | 60,385 | 40,932
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 16,744 | 13,637
Unrealized gains | 4,720 | 3,249
Unrealized losses | (1,146) | (118)
Estimated fair value | 20,318 | 16,768
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 174 | 0
12 Months or Longer, Fair Value | 4,746 | 3,235
Total, Fair Value | 4,920 | 3,235
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (26) | 0
12 Months or Longer, Unrealized Losses | (1,120) | (118)
Total Unrealized Losses | $ (1,146) | $ (118)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 1 | 0
12 Months or Longer, Number of Positions | Position | 2 | 2
Total, Number of Positions | Position | 3 | 2

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