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Securities, Available for Sale (Details) $ in Thousands | Mar. 31, 2016 USD ($) Position | Dec. 31, 2015 USD ($) Position
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,241,485 | $ 1,169,337
Unrealized gains | 19,222 | 9,878
Unrealized losses | (833) | (4,671)
Estimated fair value | 1,259,874 | 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 | 198,300 | 205,900
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 66,607 | 624,819
12 Months or Longer, Fair Value | 31,880 | 29,822
Total, Fair Value | 98,487 | 654,641
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | (115) | (4,283)
12 months or longer Unrealized Losses | (718) | (388)
Total Unrealized Losses | $ (833) | $ (4,671)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 15 | 79
12 Months or Longer, Number of Positions | Position | 14 | 12
Total, Number of Positions | Position | 29 | 91
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Within one year | $ 33,121 |
From one to five years | 295,127 |
From five to ten years | 158,231 |
After ten years | 738,332 |
Total, Amortized Cost | 1,224,811 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Within one year | 33,253 |
From one to five years | 297,004 |
From five to ten years | 162,243 |
After ten years | 747,653 |
Total, Fair Value | 1,240,153 |
Federal Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 275,258 | $ 312,580
Unrealized gains | 1,070 | 203
Unrealized losses | (26) | (1,511)
Estimated fair value | 276,302 | 311,272
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 34,920 | 186,685
12 Months or Longer, Fair Value | 9,996 | 19,801
Total, Fair Value | 44,916 | 206,486
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | (22) | (1,312)
12 months or longer Unrealized Losses | (4) | (199)
Total Unrealized Losses | $ (26) | $ (1,511)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 3 | 15
12 Months or Longer, Number of Positions | Position | 1 | 2
Total, Number of Positions | Position | 4 | 17
State & Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 39,909 | $ 31,208
Unrealized gains | 490 | 446
Unrealized losses | (23) | (17)
Estimated fair value | 40,376 | 31,637
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 3,450 | 4,599
12 Months or Longer, Fair Value | 498 | 502
Total, Fair Value | 3,948 | 5,101
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | (21) | (14)
12 months or longer Unrealized Losses | (2) | (3)
Total Unrealized Losses | $ (23) | $ (17)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 5 | 7
12 Months or Longer, Number of Positions | Position | 1 | 1
Total, Number of Positions | Position | 6 | 8
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | $ 978 | $ 177,270
12 Months or Longer, Fair Value | 10,146 | 1,066
Total, Fair Value | 11,124 | 178,336
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | (1) | (1,068)
12 months or longer Unrealized Losses | (38) | (14)
Total Unrealized Losses | $ (39) | $ (1,082)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 3 | 33
12 Months or Longer, Number of Positions | Position | 6 | 5
Total, Number of Positions | Position | 9 | 38
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 401,525 | $ 398,086
Unrealized gains | 8,279 | 4,141
Unrealized losses | (25) | (1,068)
Estimated fair value | 409,779 | 401,159
Mortgage-backed Securities, Issued by US Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 7,484 | 8,191
Unrealized gains | 551 | 560
Unrealized losses | (14) | (14)
Estimated fair value | 8,021 | 8,737
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 27,259 | 256,265
12 Months or Longer, Fair Value | 5,785 | 5,218
Total, Fair Value | 33,044 | 261,483
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | (71) | (1,889)
12 months or longer Unrealized Losses | (13) | (54)
Total Unrealized Losses | $ (84) | $ (1,943)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 4 | 24
12 Months or Longer, Number of Positions | Position | 3 | 2
Total, Number of Positions | Position | 7 | 26
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 446,887 | $ 364,936
Unrealized gains | 4,479 | 931
Unrealized losses | (67) | (1,828)
Estimated fair value | 451,299 | 364,039
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 53,748 | 40,699
Unrealized gains | 645 | 348
Unrealized losses | (17) | (115)
Estimated fair value | 54,376 | 40,932
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 16,674 | 13,637
Unrealized gains | 3,708 | 3,249
Unrealized losses | (661) | (118)
Estimated fair value | 19,721 | 16,768
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 0
12 Months or Longer, Fair Value | 5,455 | 3,235
Total, Fair Value | 5,455 | 3,235
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Unrealized Losses | (661) | (118)
Total Unrealized Losses | $ (661) | $ (118)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 0 | 0
12 Months or Longer, Number of Positions | Position | 3 | 2
Total, Number of Positions | Position | 3 | 2

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